/bind 1, "powexec_slot 1$$option_set noXp 1"
/bind 2, "powexec_slot 2$$option_set noXp 0"
/bind 3, "powexec_slot 3$$option_set noXp 1"
/bind 4, "powexec_slot 4$$option_set noXp 0"
/bind 5, "powexec_slot 5$$option_set noXp 1"
/bind 6, "powexec_slot 6$$option_set noXp 0"
/bind 7, "powexec_slot 7$$option_set noXp 1"
/bind 8, "powexec_slot 8$$option_set noXp 0"
/bind 9, "powexec_slot 9$$option_set noXp 1"
/bind 0, "powexec_slot 10$$option_set noXp 0"
Should cut your XP gain roughly in half, unless you're one o' them clickers.