>>Is it possible to use this IDE or Dev-C++ with another compiler?<<
At this moment, Code::Blocks natively supports the following compilers
* GNU GCC compiler & GDB debugger
* Microsoft Visual C++ Free Toolkit 2003
* Borland C++ Compiler 5.5
* DigitalMars Free Compiler
I think the intention is that CodeBlocks will ultimately be configurable to be used for any compiler.
For a 'do-anything' ide you could always take a look at Borland's
CBuilderX. The personal edition is free but it claims to be able to work with any compiler, although with the personal edition you'll have to hack together some sort of xml file for it to do so with your compiler of choice (currently it supports an older version of MinGW and Borland's own bcc v6 compiler so you can use the xml config files for those compilers as templates).
I know with Dev-C++ you can.
Tools -> Compiler Options -> Programs
Tools -> Compiler Options -> Directories
Correct me if I'm wrong, but doesn't dev-cpp just support MinGW (the ability to manually set directories/paths is for when you install the ide only and need to configure it for whatever version of MinGW you're using)?