i was aware of the seaming problem when using something other then point sampling, but i dislike the jittery motion it gives,and it gives the impression of bad performance
so i went thru with linear sampling and to my suprise i had no real seaming while running previews on pc and mobile,that is until you finally export.. bad seaming..
while utterly sad and broken <img src="smileys/smiley17.gif" border="0" align="middle">, i found it odd that seams only showed on export
so i searched, and its like we know a problem of float position and bleeding of the texture, to prevent that, on export there is a 1 pixel border, this fixes the textures bleeding in each other
but here's the thing, while it doesnt bleed in another texture, the 1px transparent border still bleeds into the texture, and thats the problem..
the fix: extrude 1px border from the texture outwards
this is a real approach and its also used in texturepacker
demo project with seams
same exact project with borders extruded (in photoshop) / no seams
my suggestion would be, to be able to flag a sprite as tiling and then generate this textures with a 1px extrude, only question is, where the texture borders meet, do you extrude each 1px what means you need a 2px gap, but i guess thats the only way to do it.
anyway i'm happy that i can continue without seams, yey!