Not sure why you would need to use Profilemaker. IMHO it would be an overkill.
How about Eye One Photo and variants of it?
Yes and no, depending on your needs.
ProfileMaker Pro includes MeasureTool allowing you to build custom targets which might be useful.
PMP module has more options for building RGB profiles (tons more for CMYK). Many are quite useful. But again, its only overkill if you know the options and are sure its overkill. For me, and others, its not.