I’m not familiar with your camera. You should read some reviews (search google).
Adobe 6.5 is still pretty good software, but as with anything, newer is generally better. It all depends on your needs. If your version of Adobe is doing what you want it to do, then no need to change. If you want more, look at newer stuff. I’ve used Adobe 6.5, Vegas 5, and currently using Ulead Studio 11 plus. I got Ulead for the extras and ease of use. I still use Vegas 5 for some things, and if I had the dough, I would buy Vegas 8. But for now, between Ulead Studio 11 and Vegas 5, I can do whatever I want to do.
Personally I don’t recommend MyDVD but I really don’t have any problems with it either. For strictly burning, I suggest IMGBURN.
As for your shutter speed question, I wasn’t aware that one could choose a shutter speed for shooting video. If you are talking photos, there are pro’s and con’s to higher shutter speeds.