Tipping doesn't break this forum's rules on its own, but WoW token would imply in-game gold, and that would be breaking Blizzard rules if you were giving that in exchange for out-of-game services (which addon development falls under.)
Gifting directly from the battle.net shop (or gifting battle.net balance directly) would be the way to go for what you are suggesting.
Still, I don't think this should be the norm whenever someone asks for help on this forum. There's nothing wrong with it but there's nothing wrong with just nicely asking for help either.
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