Why?
This is not the standard location or the mingw installation.
The detection is made, so 99% of the people have no problem with the installation/setup of CB and mingw,
and you are in the 1% of people that install custom compilers and you're supposed to know how to setup it.
Actually the path is the standard path for the QT SDK with Mingw integrated.
Was installed this way because NetBeans howto's said something about how to do it that way.
Anyway, this is NOT some niche, my-own-directory-structure thing.
Probably a lot of people have Qt SDK installed with it's own Mingw.
I'm asking this because Code::Blocks did NOT DETECTED the mingw compiler from the Qt SDK.
After installing QT SDK with sTANDARD DIRECTORY STRUCTURE!
Adding a few likely directory's won't hurt.
About the search everything.
Let there be an option to specify a directory and let C::B search in that directory and all subdirectories.
This way If you aren't completely sure where it is you can use an upper directory.
Multiple versions, C::B could present a list and choose the most recent one, or alphabetically or matching architecture.