Just something I noticed, I changed around a bunch of slots on the Imperial Heavy Tank to Missile Launchers in the Scripts folder, under the assumption that the changes would only take effect on servers I hosted. When I joined a game and attempted to build a heavy tank, I found that the slots were like the ones I created previously, and I couldn't put the right weapons in the slots. I'm thinking this is a bug, but if it isn't, then I feel like an unintentional hacker.
It's not a bug if you manually change config files.. besides that ut's know for a long time.. Best thing you can do is make a backup of the original scripts and replace your custom ones everytime you feel like playing on a normal server.
It will still read the server side files when you try to build a tank, it only messes things up for yourself.