I finally finished testing it. Enjoy it, and let me know how it works for you.
1. Output is in the RADIUS mode, to follow MACH3 wizards convention;
2. Axis polarity is set to be same as in MACH3;
3. Canned threading, G76 is NOT supported. Use Longhand or Alternating methods in MasterCam Threading menu (G32 based).
4. G28 references are disabled - use MACH3 Macros instead when changing tools. To re-enable change line:
no_g28g50onTC : 1 to
no_g28g50onTC : 0