Question about character creation rules

[voydangel]

I'm not sure if I should be asking how to do this myself, or if this is in the realm of a feature request, but...

How would one go about editing the starting character creation rules?
Specifically:
I would really really love to see the "street scum" character creation options from page 354 of the SR5 core. To summarize, it says that instead of getting ABCDE for priorities, the players get to pick between either BCDEE or CCDDE. It would be really nice to have this/these be options in addition to the normal/street/prime levels of play for making characters. I think these are really helpful options both for people who want to run scum campaigns, but also for making good style npc's, contacts, etc. I don't know how hard it would be, or if I could even do this myself through the editor, but I would really like to make this a reality.

While we're at it, making there be other options for the other alternate creation rules in that section of the book would be nice to have too, such as "high life" (AABCC). The others don't adjust how your priorities are set-up, but instead modify things like increasing or decreasing availability independently. Which would be nice to have as an option as well. (Having a little dial on the "make new character" dialogue where you could just increase or decrease the starting availability limit, rather than having it linked directly to "street level" or "prime runners" or whatever. It would of course need to have the chosen number displayed on the validations report or whatever for people who use that sort of thing.)

As a follow-up, how would one go about making a "new" starting character option similar to "street level" and "prime runners" starting character creation rules? I really don't think making a new "scum level" option will do what I want by simply changing a few numbers around because of the lack of being able to double up on priorities, which is what is really needed for this thing, but I might be able to get close with a little help.