What can/cannot be fastDL'd ?

Hi, I’m trying to setup a Spacebuild garrys mod server with a custom map, wiremod, combat systems etc.

What kind of addons can I force people to download on load ? I know I got maps to work, but I tried with wire and I cannot seem to get it to fastDL. Am I missing something or are there just certain addons that cannot be pushed to the client. Can someone shine some light on this please ? Thanks so much

Only: Materials (vmt, vtf), soundfiles( mp3,wav ), particles and fonts ( ttf ). ( See General Server Setup Information )
You can’t FastDL Lua.