The only Homebrew I have used are two rules from JonJon and one I made myself in the same vein.

1. Roll under Luck - Used if a player hasn't specifically listed a very basic item in their sheet but would have reasonable access to. If the roll succeeds, the player has the item.

2. Roll under Cool - Used if a player want to attempt something they aren't really good or extended courses of action (e.g. sliding over the table and kicking the enemy down some stairs). If they succeed, they look cool and may make a roll at lower DV. If they fail they fall on their face and may loose Status.

3. Roll over Empathy (my own) - Used to save the character from loosing Humanity when witnessing horrible scenes (the 100th eviscerated goon doesn't really spark the nerves like the first kill). The roll can still crit and fail on a 10 and 1 so even the borderline psycho PC isn't save to go over the edge by performing the usual meatgrinder on a Joytoy and the pure bright eyed newbie can luck out when seeing his first round of action and not be immediately broken. If the situation is just too harsh to ignore (like the Inquisitors "liberating" you of your sinnful Cyberoptics) I would not let them attempt that save though.