Originally Posted by: GarthhogMy problem is more specific... I can use it for power chords, open G chord without using the index finger, scale transitions from middle to pinkie... these things are OK. My biggest issues is semitone transitions from ring to pinkie finger and pinkie finger independence.

It sounds more like an independence issue between your ring and pinkie fingers as I'm experiencing the same problem. In fact, I'm finding it harder to play descending scales i.e. lift fingers off the frets as opposed to placing them down, so I don't think it's so much a strength issue.

As a relative beginner to lead (and I stand to be corrected), it seems to me that finger strength and stamina seems to stem from developed/used forearm muscles rather than the fingers themselves.