OK, I got the 'config' thing sorted, I can now tell my 'exe' to use v1.0 framework only.

What if I wanted it to use v1.1 only, which I would prefer, yes, I can change the config file to use v1.1 but wouldn't I surely need to take advantage of that also in the IDE whilst I'm compiling e.t.c. so the actually development environment is using 1.1?