He answered it !!
I already have 1 mod installed (convoy routes map).
1. Can I install it over my modded SH3 ??
2. I am also right now in mid-campaign (1940). Can I install it without losing my campaing ?
2.1 Does it also apply to the mods ? Can I mod/unmod withou losing my campaign ??

I wanna be a pirate in my next life . . . This also means i dont have to bother doing good actions in this one !!!
Thanks !!