It's been asked not too long ago, but I can't find my reply to it, so I'll say the key points again:
for TWPatch I'll make it, so you can choose between 3 modes: both, top only, bottom only
it's not possible to make a separate one for top and...
Oh... there has been, I just went full goldfish, and completely forgot I did anything...
I figured I can split GBA and DS(i) scale filters instead of trying to combine the two into some janky file format, so if I don't forget again, I'll cobble...