I currently own a Wave, two Surges, and a Skeletool. I've been EDCing the Skeletool since they first came out and love the thing. I sometimes put in the pocket using the clip, but most times I clip it on my belt loop with the biner. The knife gets plenty of use as well as the screwdriver and pliers. The bottle opener has come in handy countless times for my beverages and those of others. I can deploy that opener on a bottle faster than openers that my friends own. What would I add to the Skeletool? Nothing. It is a minimalist multitool. It is a knife and pliers with a couple extra goodies included. I don't want the bulk and weight of a normal multitool.
Besides, if I need some more Leatherman power, I just reach to my EDC bag and bust out my Surge with optional bit kit. Leave the Skeletool as-is!