Warrior General Games

i saw some kickers who put a lot of skill points into agility... is it useful?

You need some. It probably ranks #5 after Kicking/Confidence/Vision/Strength. Getting it to 49 by level 45ish seems on-schedule (hope to god that you've trained it a lot and don't have to spend a lot of SP in it), and once you do cap it you'll probably be training it out for the rest of your career. I wouldn't spend SP to 2nd cap it, that's for sure. No one really knows if a ton of agility is worth the investment, as examples of good high-agility kickers are answered with examples of just as good normal-agility kickers.