To be honest i dont think its an easy task to do.

This is because when BI is installed, it adds and uses certain RTW files, so with a RTW mod installed and BI installed many files are overwriten. All i know is that there are a great deal of bugs around, and converting SPQR to RTW 1.5 would require a lot of effort and time, as long as the patience of a saint.

To activate show_err, right click the rtw icon, and on target, it should say "c:/program_files etc... Outside the brackets, type in -show_err and it will activate show error.

There are quite a few useful command line shortcuts like this one, i saw a thread somewheres but i cant find it.

Cheers