A quick question about addons in general...
If I download and install some of these, such as kegetys Addon Collection, will they alter the campaign/original single player missions in any way? I know that Satchels sound pack does (meaning new sounds rather than the default ones), but I'm not sure about the weapons, player models, etc... Or do they only come into effect when I create a new mission with them or play a downloaded map which includes them?
Just being cautious, as I don't want to throw the game balance out of whack.
