So without permadeath on it's very easy to die a dozen times with a character in the late game and quickly have taht character take over your entire high scores list, turning it into more of a "highest score" list. Would it be possible to put in some mechanism to check and see if the character is already on the high scores, and then just change the existing score of that character (and possibly resort the list) to prevent your high scores from being just like, one name? Not the most pressing issue but still.
This IS the most pressing issue. It allows you to truly know where you actually stand. This screen also needs to record how many times you actually died. If they wanted to go a step further they could even do the division for you to find how much EXP you actually made per death.
Doesn't deal with the issue though of differentiation and separation in order to acquire more accurate scoring. Dying 30 times and getting a score of 1 billion is not the same as getting 400,000 on Going Rouge w/ Permadeth.