Seeing that you already have a copy of BobCAD CAM V24, there really is not need to purchase other software. You'll find that making changes to the post is easy enough to do yourself, but if you would like me to help I can.
Yes I would turn subs off, and yes the post processor can be setup to fire any m code you want at the start of cutting and at the end of cutting. If you want to use a dwell you can do that aswell.