scolaner :
Interesting. What do you use those (at least) 8 buttons for?
What would your ideal number of buttons be?
depends on the game. for thumb, scroll tilt, and my extra ring-finger click =
shooter: crouch, prone, toss(grenades/items), switch(grenades/items), fire mode, fire rate, melee/weapon bash, flashlight.
rpg: crouch, walk, cast, switch spells up/down, melee, switch items up/down, use items, 1st/3rd person, target lock, special moves, # 6-0, etc.
some have more options and get more use of more buttons than others of course. depending on how well the gameplay has been designed for mouse/keyboard; 15 combat commands all ready for my right-hand. leaving the 16-20 immediately next to WASD available for basic movement and menu commands.
even for regular Windows use I have ctrl, delete, home, end, pgup, pgdown, +, - all mapped to my extra buttons.