I totally agree that there are a lot of questions where the minimal understanding close reason would apply and is better than any of the other canned reasons, but on the other hand, I don't think a more accurate close reason matters.
Any small (3 custom off-topic, I think, + too broad and opinion-based) set of canned explanations isn't going to cover every situation.
Most of the people asking questions that get closed for one of the canned reasons don't understand that they're boilerplate text and are sometimes approximate. Most of them don't understand the SE system well enough to come back and ask the right questions to clarify what's wrong.
The existing close reasons also apply to a lot of questions and I'd hate to lose them.
Frankly, I've gotten tired or reading so many crappy questions, I do some close reviews and vote on those, read a few questions on the Newest tab (and usually vote to close 1/2 or 3/4 of them 'cause they're crap) and that's it. So ultimately I don't care too much what they close reasons are, if I see something and think it should be closed, I'll find a suitable reason.
For some perspective on our whole river of crap, I've noticed a few other sites (English Language and Usage, Christianity, and Movies and TV) have been complaining about a similar (but much smaller scale) "flood" of crappy questions. They're asking the same questions about what they can do about it, is it driving off higher-rep users, etc., and they aren't figuring out anything to do about it any more than we did.
Back to the actual question: If I had to give up one of the existing close reasons...
Questions seeking installation, configuration or diagnostic help must include the desired end state, the specific problem or error,
I use this a lot, it covers all of the "how do I install/setup X" and "X isn't working, what's wrong" questions.
Requests for product, service, or learning material recommendations
This is pretty much a standard SE reason, and gets used a lot.
Questions on Server Fault must be about managing information technology systems in a business environment
I use this a lot, because I think most of the questions that people vote to migrate to another site are crap and should be closed in place.
Questions should demonstrate reasonable business information technology management practices.
I use this a lot, covers X/Y problems, "you're doing it wrong" and "OMG WTF BBQ?!" questions.
So that leaves the control-panel reason which does get used a bunch, but could maybe be absorbed into the reasonable business practices reason? This would be my vote for the least-used of the current bunch.