But isn't the template support for the nightly builds fairly complex?
You see, all this registry hacking was so complex that nobody really understood what went where, and it never really worked reliably either. Therefore we said "fackue" at some point and threw all that stuff overboard.
The present system does not store anything in the registry at all any more, instead the settings are in a config file. The actual build system has undergone some changes too, but it is basically still the same. Besides, most serious compilers that exist are supported more or less out of the box already, so chances are good that you don't need to do a lot of "custom" stuff. If anything, you may need to adjust 2-3 variables, unless what you want to do is very, very, very exotic.