[Tyhm]

Or onwall2(x,y,bitflag), or integer onwall2(x,y)=bitflag for on wall, on land, on throwthrough, on water, on shallow water, on chair, on bed, on lava, on shallow lava, +8=on player, +16=on NPC...

The "simple" solution in the meantime is to make a string for all the onwall tiles (It's easy!...if you make an NPC do it for you...), then check if the tile at that location is in that list...but yeah, Stefan coding something is always more efficient than my workarounds. :-P