Here are the answers to your questions:
1. No. You'll need to export as SVG in order to import a file that was created in MTC. The good news is that you won't lose your layers.

2. No. And there's no feature in MTC to do that, either.
3. It appears that SCAL does work with Cameo's dual tool capability. I'm not a Cameo 3 owner but I just added the Cameo 3 to SCAL and you can assign layers to be cut or drawn with a Tool 1 or a Tool 2. The same setup appears with the KNK Force, except that we refer to the two sides as "Left" and "Right".
4. Can't answer this one as I don't own a Cameo 3. I can say that on the KNK cutters that I support, PNC is just as accurate from SCAL as from other programs.
5. Yes! SCAL works with all of the KNK cutters including the latest models: Zing Orbit and the Force. KNK also offers a discounted price on SCAL4 when purchased at the same time as a KNK model.
Let me know if you have other questions.
_________________
Sandy McCauley
Manager of Customer Relations and Education for KNK USA
Owner of
http://www.iloveknk.com/