Please, provide a way to backup the texts.
Or, at least, provide a API access to the texts to allow developers to implement an application for SMS backing up.

Currently, when developing a alarm clock app, there is no way to tell if the user has his phone set to vibrate only, so a soundeffect set by the user is played even if he has set his phone to vibrate. I find this very confusing, even though the builtin alarm clock behaves the same way.
This would also be good to have for games, so when you launch a game in a quiet environment not all heads turn the user's way :)

It would be beneficial to allow other messenger apps and social apps to come on board and allow their updates to show up in the people hub and messages to show up in the integrated messaging system. This would be great for any 3rd party app that has any social or messaging means to be able to leverage that kind of interconnectivity, example another IM provider (ex: Yahoo), social network provider, even apps for forum postings.

Right now it's not easy to enable DataBinding on the ApplicationBar buttons and menuitems.

- When created in Xaml there's no way to get a reference to them, should be different.
- Should be easily bound to a command, same as for icon and text should be bindable.

Please add support for Bluetooth Low Energy and Bluetooth 4. This will allow the development of applications that can support existing standard accessories and solutions across platforms. iOS and Android supports BLE. The WP8 hardware supports Bluetooth 4, but the software on WP8 does not allow the use of BLE.

For creating more contact centric views of contacts

The lack of Reflection.Emit in WP7 stops developers from being able to properly test their frameworks. With no Reflection.Emit it is impossible to build a Mocking framework and actually test WP7.

The lack of Reflection.Emit is also blocking the OData Client Library for WP7.

Allow to developers create a custom keyboard. eg. choose letters and numbers together

For vNext it would be really great to have ApplicationData.RoamingFolder supported. It can enable some really cool and also cross-device experiences.

http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.applicationdata.roamingfolder(v=win.10).aspx

A business feature that would be really nice to have support for it the ability to tie into a VoIP network for voip phone calls... the most common architecture is the SIP (Session Initiation Protocol). So I would like the ability to configure a SIP client that ties into our VoIP PBX and phone system.. so my WP7 would basically become my desk phone (extension). The only way this would really work well is if it ran in the background like the phone's native phone functionality.

Allow the BackgroundAudioPlayer to play tracks from the MediaLibrary. Or allow applications that implement the XNA MediaPlayer class to run in the background.

It would be good to have a Video Chooser Task that works in the same way as the PhotoChooserTask. The reason for this is for users to be able to do things like apply filters, add audio tracks, crop out a relevant section, etc... of a recorded video and saving it back to the MediaLibrary. I assume saving to the MediaLibrary will be part of the AR functionality in mango anyway?

Want to have a feature. Allows software products from the same Publisher, accessing IsolatedStorage. And can communicate with each other. Start each other (optional), which can be expanded larger developers ideas and more powerful than iOS and Android system.

This can save storage space, unified data storage location.

Or another form. Developers can provide their main program with subroutine. Subroutines can be run separately. Main program can manage/run program. In this way, developers can provide independent extension to process the data.

Wish to consider this kind of system design.

PS: above I use the online translation feature.

The Toast UI metaphor is useful for showing transient messages to the user such as authentication failures or other other messages that do not require the user's immediate attention.

In the current ShellTile API, a toast will not be displayed if the current foreground application is the caller of the ShellToast.Show method. It would be great if this was changed so that we could present in-app toasts. We can then user the NavigateUri property to navigate the user to a different part of the app if necessary.

We are limited of saving the Images to the Media Library.
It will be better if user can add the downloaded Audio , Video can add to the Media Library from the Isolated Storage.

Single task is back
Please support a task running in the background, or snap. And you can switch, similar to Win8.

If WP7 had a Siri-like speech recognition system, it would be great if apps could contribute their own functionality to the list of things recognized by the system speech engine. For example, if I write an app that can locate my friends, my app should be able to contribute the verb "locate" to the system-wide speech engine. Whenever the user says "phone, locate my friends" my app will be a candidate for being launched to perform the action.

Needed to create pro level sequencers, synths and music creation related apps!