I occasionally trim Wickett's but usually only if he gets into something like the others. Of course, once in awhile he'll come out of the potty and shake his paw. It usually when I hear all the litter fly off his paw and hit the walls, floors, furniture, or my face! that I trim them.
Delilah's I leave alone. For Griffin and Bastian, I trim the bottoms of their feet. They like to dig in their litter a lot, and it tends to get stuck in the hair between their pads, so I trim it to try to prevent some of that.
Ginger and Ferris both have lots of fluffies on theit feetsies, and I too will ONLY trim it if it gets clumped with litter, otherwise, I leave it alone.
I love Stan's kitty feathers!! I only trimmed them the one time he stepped in the water and then in the clumping litter He sounded like a dog...click clack click clack...when he started walking funny I had to cut the clumps off.