It depends. Many BRP-based games have way too many skills and far too few points to spend on them (stares sideways at Call of Cthulhu). The Troubleshooters is about as far as I'd go when it comes to the appropriate number of skills (about 30, some of which replace traditional attributes like Strength or Agility).
One of the better innovations I've seen in a BRP-derived game was in Dragonbane's ancestors Drakar och Demoner Expert and Drakar och Demoner '91 (DoD's version history is somewhat confusing, but most people would consider that version 3 or 4). In Expert, skills were divided into type A and type B. Type A were classic "roll under or equal on d20", and were measured on a scale that was mainly 0-20 but could go higher. Type B were skills you'd pretty much never roll for, you just could do the thing at that particular level, and they were measured on a 0 to 5 level. The main things I recall using type B skills were languages and crafts. In '91, some changes were made to the rules for acquiring skills which meant type B skills couldn't be treated as a wholly separate thing. But they kept it around in the system, with a table for converting type A skill levels to type B – but that meant you could treat any skill as a type B skill. It wasn't very well-supported in the system, but it was a cool idea nonetheless.