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As far as I know, using bugs is prohibited (as is openly discussing them, especially including them in a guide). If some resource freely uses them, I honestly don't understand: how is this better than casting magic twice in one round!
and who says that you need to use them? :) although this is a separate topic,
and a guide, in my opinion, is a guide precisely because it should contain the most complete information about features/bugs, and each person decides for themselves which ones to use and which not to (or by mutual agreement, if they are playing together :) )
you also wrote about this :)
Any changes to the rules are allowed by mutual agreement of the players, except for item 6. That is, you can play according to mutually agreed rules and even without any rules at all (again, item 6 applies under any circumstances),
best regards, smallest