Include 1x2 sized tiles
Want to be able to have small rectangular tiles on home screen, rather than only tiny/medium squares or huge rectangles.
That is a great suggestion, however that is not a dev platform feature. Please provide feedback via the Windows Feedback tool built into Windows 10 or via http://windows.uservoice.com/
For the sake of discussion let's consider that tiny tiles are 1x1, normal tiles are 2x2, and large tiles are 4x2.
Assuming your preference is for 1x2 (tall) rectangles. What about 2x1 (wide) rectangles?