Ehm, you have misunterstood what i said. Sorry for explaining it poorly, my bad :/
I WAS always able to change the trajectory, at any time. My complain here is that i HAD to, even when i didn't wanted to do that, if i wanted to adjust the force: there was times where i was ok with the default trajectory of the ball but i couldn't adjust the force without changeing the trajectory a little bit
Hope it's more clear what i meant, and i hope i have cleared the misunderstanding now. Cheers (^u^)