Haven't heard of great UI solutions here, though it might be better to have some customizable gesture for window management trigger, after which you can do the

Haven't heard of great UI solutions here, though it might be better to have some customizable gesture for window management trigger, after which you can do the same as on a desktop holding a modifier: touch/drag from window center area to move touch/drag ~20-30% of window's sides/corners to resize in that direction