I'd like to be able to cap the score for one category at 100%. (I use weighted categories for overall grade calculations.) This category contains assignments where students can work ahead (by doing extra tasks one week) so that they have a cushion if they need to take a break the following week. As of right now, I have a manual and complicated system of "banking" extra points for them, then "re-allocating" those banked points when they get behind. I do this solely so that the category weight doesn't exceed 100%.
I'm not using this for any "extra credit" purposes, but to allow kids to work a bit more at their own pace.