One could solve the timestop conundrum by not being in line of sight when you begin. It's just super useful to have and you don't need to do anything super naughty either, you can do 'harmless pranks' like picrel, there's just so much potential. Though around other people with powers you really need to exercise caution. Timestop can't save you if you've been immobilized.
Cloning could be a double edged sword depending on your personality/mental state and the specifics of the power. Can your clones use cloning themselves? Are your clones autonomous? If you don't have a solid state of mind, could your flaws could be passed to the clone? Could your clone have greater ambitions and decide to take your place as the "original" you?
I did read one manga where the MC implicitly understood the mechanics and used a Player 1/Player 2 mental crutch. The clone understood their place as Player 2 and knew they had functionally unlimited lives so long as P1 lived, so they were able to do more risky and dangerous things they wouldn't have done otherwise.