it already is a rule, since:
Do not exploit bugs or glitches, either in GTA, SA-MP on this server
You don't really need a list of bugs, nor tutorials on how to perform them in order for it to be forbidden. Rules are pretty clear on this, the only
shady thing is why admins/moderators ignore it. Do they not know the rules, do they not know the samp bugs or were they told not to punish anyone for it. No one knows, which is why this is a mess and looks pretty unprofessional, especially when it was pointed out long time ago with 0 response.
Make up your mind and either stick to the original (already written) rules or change them and make an announcement.
Also, G-abuse is something else. This would be more of a "passenger seat" abuse.