Please, just consider removing gimmicks like this before the full release.
+1
For me, the main reason to remove it, aside from just being a ludicrous mechanic, is that enemies don't use it. At least I've never noticed it. There should be no exploits the player can use that the enemy AI can't also use. The AI is already at a huge disadvantage against a skilled player, unless they have large numbers to compensate. And I really don't want to see enemies dipping their weapons in acid or fire against me, either.
They do however often have acid or fire arrows at least. Seen that a lot. I do not know whether they have them on person, but they do fire them. I am torn on this, it is a tactical feature, and it can be useful. The candles, however, well that is a bit over the top. Dippng is a bonus action though and therefore a resource, generally worth it and is not infinite either, it seems to last only a round or so, when done out of combat. In the end, isn't it like the Flame Sword spell?