GUC variable set, TODO

Hi,
I might have some time left to spend on the item "Allow external interfaces
to extend the GUC variable set"
filed under "Administration" on the TODO list. I'm thinking of an approach
with the steps:

1) Increasing my own understanding of the GUC code
2) Suggest a solution on this newsgroup
3) Implement and submit a patch

Any advice is greatly appreciated. Especially the ones that might speed up
step #1.

Comments, suggestions?

Regards,

Thomas Hallgren