I just hope they could use a third-party application of their choice for us to use in order to add these limitations anywhere we want.
I would happen to agree and disagree. What I disagree are, there may be some disrespectful developers that wanting to crash their game servers down often, searching for security holes to break in, and such. And what I do agree are, the official game developers may have missed a few glitches, security holes, and/or protection, the old games may not have admin system to control the server or its ability to be more control to players by hosts' choice, and such.
However I have no knowledge with gameservers.com hosting the game and how they set them up. Meaning I have not pay for their Halo CE hosting plan. If I know how they set up their own hosting for Halo CE such as additional files other than inside the maps folder, then I could meet their standard restriction if there is any.