sorry Guran, strengthening fingers is important for any instrument, my ring finger was weak but by using it alot i have strengthened it.independence of fingers can be achieved via practise. a simple exercise that pianists use, enables this to happen.
rest all fingers on desk, as if you were playing piano, then whilst keeping others down lift one independently, this really helps to strengthen fingers and enables independency to develop. please heed the words of john k not guran.the proof of the pudding is in john ks playing