There is a feat that already does that: The lucky feat.
Inspiration and lucky gets you to roll again, even enemies in the case of the lucky feat (halflings also reroll nat 1s).
Giving that for free to the players would be playing, not in easy mode, but in story mode, but yeah, that is a way to create an easier mode for people that want it that way, indeed.
Last edited by _Vic_; 21/06/20 01:52 AM.