Why is it that the DMs here feel that it is necessary to "protect the playerbase from itself" (hullo big brother!) here?
I've been on many other RP servers (Dalelands, Tales of Amn, Skullport, Realm of Darkness) during their respective primes, and have OOCly communicated quite a bit. No-one, not the DMs and not the players seemed to feel this was an issue. Everyone was having fun and for the most part, everyone was willing to play along in the story. If someone had an issue with bullying (or rule breakage, of course), they went to the DMs privately and it was resolved.
I've spoken to players here during RP and outside of it. There has been no indication that people are uncomfortable with RP. However, that could be due to the type of people I have spoken to as well. I have -seen- people who OOCly bicker, but that is usually due to an evil character going too close to the FAI gates (this RP makes me uncomfortable!) or when an even doesn't unfold in a manner that favors their character (this RP makes me uncomfortable!).
Quite side-note: Due to my own experiences, please do forgive me if I sound a bit jaded

After all, wouldn't want to make me. . .uncomfortable!
If this is indeed part of the DM's agenda, perhaps a more clear-cut definition on it in the context of BGTSCC might help.
What is peer pressure, in the eyes of the DMs? Is it an assumed phenomenon, caused by a player not asking another player repeatedly if they are comfortable? Is there any evidence of its wide-spread presence, as it should be wide-spread enough to warrant the damage the rules "preventing" it cause (stifling RP, causing distrust towards the DM team, etc.).
Why are creating rules necessary, verses say a simple PM informing the DM team they are being bullied or don't feel "good" about a bit of RP?
There is a fair bit of danger in this agenda, as well.
What is uncomfortable? Can a player call a DM in, and will the DM just abide by their claims of the RP being uncomfortable? Could it be used as a "cop-out" for when RP isn't fitting a player's OOC narrative and want the RP to go a certain way for them ICly? If the DMs investigate claims of the RP being uncomfortable, what methodology do they use? If a player feels like a certain bit of RP just isn't fun at the time, is that enough? If they are indeed being peer pressured, and they choose to PM the DM after the RP is concluded, how is it dealt with?
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Regarding DM Ghost's offer for suggestions, I have one:
The sever's rating is an important one imo. It is less important for the person's OOC age, more it sets an expectation of a level of maturity. We could do this:
Make the server an 18+ server. This sets an expectation that the players are legal adults, and are expected to act like adults.
Ban ERP, and make any sort of "heavy" torture RP (gore, etc.) banned as well.
This will be completely identical to the server as it is now, save in one key area: The expected maturity level of the player base.
Most players on this server (all, if I am not correct! The ones I knew were below 18 back in the day are now 18!) are already adults, and now players will be expected to deal with issues like adults. Either talk it out amongst ourselves, or PM DMs and ask for assistance with specific situations.
Honestly, rules are not needed for this agenda. Even with the rules in place, a PM is all it amounts to anyway. Unless DMs are hovering around, assuming people are being peer pressured into situations.