My view on the subject is this:
Unless you are soldering only one wire per contact, you definitely want to use QD's. Soldering two wires to one contact can be a real pain (literally) with all the twisting of wires, etc...
If you are using hacks for your CP, it becomes even more important. One day you might decide to put a real keyboard encoder in there and then you would have to desolder your wires to remove them.
You can trust me on this one, I just went through it with my cab. I had the full gamut of hacks in there and switched it over for a KeyWiz encoder. It took me twice as long to remove all the soldered wires as it did to replace them with the crimp connectors. It would have taken me even less time if there wasn't solder all over the connectors making it harder to push the QD's on.
The $17 for a good ratcheting crimp tool is the best money youll ever spend, plus it's good for plenty of things other than control panels (electrical, automotive, etc.)
My .02
RandyT