A suggestion that probably wouldn't be able to be implemented any time soon (if at all, who knows how much space and processing power peppy has for scores), based on this quote.
Other things people suggested that can possibly replace this is displaying the computed difficulty stats of a map in the client. That way people trying to find the best gains (or looking to improve their acc/aim/speed) can see what the best mods to use are (kind of an analog to those looking for points being able see the multipliers for their score with different mods turned on).
--edit to remove "farm"--
Overall I'm loving the new pp system, I gained 24k ranks woo~
The new system does not just multiply the value of map when adding mods, it calculates a whole new difficulty with the mods. For example, if you're playing a map with DoubleTime, then the algorithm will calculate a new difficulty value of the map, considering it to be 1.5x as fast.Since these are calculated as a whole new difficulty, why not save each mod combination's score on its own for performance purposes? Everyone can still vie for top ranks with the current score multipliers but they will still get Speed fro their DT play, and Acc from their HR play, etc, etc. Then everyone is happy and if later you get to see what pp/Speed/Acc/Aim you got from a rank you can see what each mod combination gave you.
Other things people suggested that can possibly replace this is displaying the computed difficulty stats of a map in the client. That way people trying to find the best gains (or looking to improve their acc/aim/speed) can see what the best mods to use are (kind of an analog to those looking for points being able see the multipliers for their score with different mods turned on).
--edit to remove "farm"--
Overall I'm loving the new pp system, I gained 24k ranks woo~