Sergeant Knight at Arms
I can't edit the pinned topics at the top, like the main download or strategy guide threads.You can still edit your own old posts by yourself. Beside the suggestion thread all other threads are owned by you yourself. So I don't see an issue here which should hinder you at updating them. If you could please elaborate on that.
The permission has not been redacted based on your own activity alone but also on the general activity on the subboards. You don't need to be able to moderate the posts of users within the subboard when there is rarely any activity anyway. The few cases which might come up can be reported and will be handled by the respective subforum moderator, in your case by me.
We did this at the other subboards too, for example at the modding section alone more than 170 non-moderator subboard owners got their moderator rights redacted out of the same reasons.