I'm not sure what exactly you did vote on. Was it a clarification for the fire engine sticker where the flame color is transparent and meant to be stuck on a red brick?
Anyhow, since it's not ruled out, I think using color 16 for the transparent bits makes sense. Then if you want a "real" sticker for show in an inventory list (or in instructions before it's stuck onto a part) you can use a trans-white sticker part so you can see the whole thing. Then make it invisible by using the color of the part underneath when it's attached. The program (LPUB?) should be able to do this for you, as long as there's something in the name or the header to identify it as a sticker.
Of course this might mean you can't reproduce the real instructions where they cheat and replace transparent flames with red and leave the other transparent bits trans-white, but I'm ok with that.
Keep up the good work.
Anyhow, since it's not ruled out, I think using color 16 for the transparent bits makes sense. Then if you want a "real" sticker for show in an inventory list (or in instructions before it's stuck onto a part) you can use a trans-white sticker part so you can see the whole thing. Then make it invisible by using the color of the part underneath when it's attached. The program (LPUB?) should be able to do this for you, as long as there's something in the name or the header to identify it as a sticker.
Of course this might mean you can't reproduce the real instructions where they cheat and replace transparent flames with red and leave the other transparent bits trans-white, but I'm ok with that.
Keep up the good work.