Happy you like it. Basically my idea was that skills (with a limit, let's say a total of 10-15% for level) could be raised by using them. I dont know, maybe a skill point every x-*roll a number between 1 and 100* uses? I hanvet tought to a true formula to calculate it, however i dont think this is too imba or impossible to do. So, Concerned Wastelander, dont worry, i'm not suggesting of using Oblivion's level system, but to add a chance of learning how to repair-build-shoot by just practicing a little. After all, half of characters in Fallout learned their skills in that way, teorically.