The teams are mostly lurking around the suggestions forums and gathering feedback on how we can improve the server, and while it may look like we're ignoring players suggestions this really isn't the case. In order for a suggestion to pass you'll usually need to do some research and explore your options on how to bring content into the server, and this content needs to maintain a certain standard - it should be well structured, optimized and secure so that others in the teams are able to review and make changes. This means that taking a few code examples from the wiki or a community resource might not suffice even though it could greatly speed up development of the server.
As indicated in the 1.6 news post we have the second part of a major update simmering behind the scenes, bringing yet another portion of fun to the server, and while I'm not part of the development team I can tell you with confidence that what we are working on with the devs is something worth looking forwards to. You might also see a few suggestions make it to the game.
Some teams in the clan dedicate hours into keeping the community safe and sorting out any issues and admin requests, while others like to spend their time resolving bugs and adding regular updates which aren't kept waiting for the major version updates. We have a set of guidelines for server moderation, and I'm happy to let you know none of us enjoy issuing punishments but moderation is a vital part of managing larger communities. Punishments are not handed out left and right, and to prevent exactly that, there are teams who audit decisions made by the team and provide feedback where needed. Without the efforts by these teams and outstanding community members who take a step forwards to help, I'm not sure the community would sustain this long.
At the end of the day we are dealing with a 19 year old multiplayer modification with a great deal old code, and this naturally places a barrier between new people wanting to invest their time on this rather than projects on more recent game engines where possibilities are on another level. Some MTA servers have established themselves as "companies" and pay their "employees" while other server contributors charge for their works much like a freelancer would. Not all servers have the fundings to support this, which can be a contributing factor to less development. Be the change you want to see, whether that is helping out financially or contributing by other means!