The phrase "wild imagination" means having a very creative and vivid mind, being able to think of imaginative and sometimes unreal things. Full definition
Instead of letting them have free reign / wild imagination Lots of great looking food! (nutritiouseats.com)
But thats not what Just Cause 2 is about, it's a game where missions are not as important as coming up with the next insane stunt, people with wild imaginations will be able to do alot with Just Cause 2 it's just a shame the game is let down in other area's and that stops it from becoming a truly fantastic game and instead puts into the «good» catagory, but if you simply want a fun sanbox game then Just Cause 2 stands above the rest. (wolfsgamingblog.com)