I used to roll a lot in the old BG series. I got pretty good at tapping the "Roll Again" button quickly, but then I became too good ....
78, 82, 73, 77, 81, 76, 76, 82, 79, 91, 80, oh @#%!
I have a mod that adds an in game autoroller to IWD's U.I. It just keeps rolling while saving the highest value. (totally have no idea where I got the mod though as I've been trying to find it again but can only find an external auto roller) The actual easiest way to do it without mods is to have cheats on and just press CTRL+8 to give you all 18's and then just lower the points to what you want for the character. The game lets you continue even if you have left over points. Only bad thing about that is the perfect 18/00 Strength it gives you as there's no way to randomize the d100 roll.