I would like to see an increase in the number of available petitions, but not because I am part of an anti-scam crowd. I have run into issues before where I have had too many legitimate petitions on one character, and had to log in with one of my alts in order to file a new one.
Not a huge game-breaking deal, but still annoying.
Once that whole debacle was over, I did petition to have my petition limit increased, since I thought it was a dynamic value. I was told that the number was hard coded and that it could not be changed on a per-user basis.
Perhaps this could be changed. People who use the petition system for legitimate purposes should be allowed to petition to have their limit increased if they feel it to be necessary. The GMs can look over that character's petition history, and if they are using the petition system as it was intended, the petition limit could be raised.
Conversely, people who continually abuse the petition system to attack legal (albeit slimey) behavior and just end up wasting GM time, like the OP, should have their limit reduced. Perhaps to 0.