I prepared this little document for our games. These are house rules that we use and I wanted to have them collected in one place. Use if you like.
The Crit and Fumble rules are borrowed from Delta Green. Then I use the Crit & Fumble tables from the BRP Big Gold Book (BGB). Pushing skill tests are from CoC 7e. Skill difficulties are from MRQ2/Legend. The Major Damage rules are from Targets of Opportunity (DG) and finally the movement rules are an amalgam of BRP BGB, 7e and some home brew.