Favorite Spells for prepared casters

I've played several druids and clerics and I would love a way to mark spells as favorites so that I could quickly find spells I use often when preparing spells after a long rest.  I know I *can* cast continual flame, but my abilities are all ice-themed, so I'm likely never going to cast that first level spell.  It would be great to be able to see what spells I have favorited or enable/disable specific spells in a known spells list for casters that have access to the entire class spell list.