It seems difficult to set up a category to show more than one of: points, percent, weighted percent, and letters (involves creating additional calculated fields?
Possible solution: At the right? (in a column?) Of each category have an option box to allow the category to print: letter grade/ points / %age / weighted %age. This is important... because at the moment it seems that if you want to display points and weighted %age - you have to create additional categories, rather than selecting an option?... in 1.8 this was much easier, and I am sure lots of people want to be able to show points / percent / letter grade per... eg: Semester( a category in 1.9 gradebook)
This is also important b/c this impacts what is seen in the user report... and I think most people need to be able to choose whether to (optionally) display points, weighted % , or percentage - or a combination of the three( weighted % contribution to total grade vs parent category is an issue for setups with categories within categories)