I'd like to see an additional text field for rules. The standard one keeps the rules as is, and can be written out as is. Then there is a shorthand text field for the same rule, to condense it as much as possible.
Initial implementation would allow you to globally choose "Full" vs "Shorthand" rules for viewing/printing roster. A possible future improvement would be to allow a user to choose per rule - IE shorthand the ones you're more familiar with, and use the full description for rules you don't remember as well.
I quite like this :)
It will be a while till I find a chance to implement it however.