Yes they could GL only gave us a taste of the lightside/Jedi power and darkside/Sith power can do they can do mind tricks, force push & pull choke,force lightning and more.
If you watched ROTJ (return of the Jedi) then you would see that when Yoda was trainin Luke he told him to pull the x-wing out of the swam Luke:"i'll try Yoda really inoyed "no try eitheir you can or can't and he pulls it out.
Luke failed in beliveing in that you can do anything if you know you can do it or you do it can if you belive you can.
And thats another thing why Yoda didn't want to train Luke he was to old when your young you have open mind and belive in what your told to so thats why younglings were trained so young but Luke was old and had lost all his child likeness so it was harder for him to learn.
Back to the topic yes Jedi can alot more than what we've seen they just have to believe they can do it.
But why didn't it show the Jedis didn't using more force power because Lucas couldn't think of any more to put in the movie i guess.
I could think of tons more.
