I've always been fond of that particular rule variant - '...want to show off your slick breakdancing skills? Give me a dexterity plus performance check!' - but it's never done anything but confuse the heck out of my players.The core game of 5e already gives you guidelines for using other Ability Score modifiers to apply to skill rolls when appropriate. As we've seen in the playtest for D&D One, attack rolls and skill rolls are both going to be considered "Tests" with the same rules. Why not apply this to your game right now - especially when it allows a player to make the character they envision and everyone has more fun?