there is a solution but have some problems.
if you use layerd entity(ent_createlayer) , no need to resize images .
problems:if you use camera.arc or shader on screen , objects will afected.
another idea:
if you use some image for menu,use a constant resolution like 1024*768 and in game use user choiced resolution.
but finally i have same problem to streaching image and quality.
any one know how other game and game engine solve this problem?