I've played in a game that uses most of the combat options on an ad-hoc basis - i.e. if a players says 'I want to accomplish this' and it's covered by one of the combat options but not the basic rules, then the DM usually uses those rules or some other extrapolation.
The same campaign also uses Lingering Injuries in an interesting way. Once per session (i.e. not once per player, but once in total), while dying a PC may opt to take a random Lingering Injury to automatically stabilise instead of rolling a death save. Personally I'm not a fan of this specific house-rule (I'd rather see them used for massive damage), but the other players mostly enjoy a bit of the old subtle PvP action so it generally goes down well with them.
Put me in the group that thinks Sanity checks for any spellcasting is a bit too much... but I think they might work well for ritual casting. I.e. make a check any time you cast a spell as a ritual.