Hello
My name is Mark - I recently inherited a CNC Router (Chinese made, 60x90cm) which is controlled via Mach3 on a Windows XP machine.   I have been slowly getting it brought up and running, and today generated a new configuration file for my machine which seems to have fixed many of the issues that I was having.  Hopefully I will reduce the number of broken router bits that I am generating 

.
I use Fusion 360 for my 3D CAD/CAM tool, however I have little experience with the CAM portion - just now generating GCODE files to drive the machine.
I'm glad to have found this resource. 
A couple of questions:
The version of Mach3 that I am running seems to be 2.0 - should I be thinking about upgrading it?
My Machine doesn't have a STOP button, should I be thinking about adding one?   The manual seems to imply that this is a requirement.....
I am located in the Portland Oregon area.