So I decided to test something out today to see if the MOTD window (outside websites) can trigger things to happen in game. Well, they can. I added a new MOTD spawn menu to the cheat/build server as an example.
Just type !spawn and this window opens up:

All you have to do is click on the prop you want, and it will spawn where you are looking in game. Obviously, the cheat server (and HL2DM servers in general) aren't as populated as they once were, but this is just some ideas we have that could maybe be useful in the future and in other Valve game servers we run.