Hacking RR

[Mikey]

Guys,
One of the things I have been strugling to do with RR so far is to
hack it, i.e. to tweak, modify, and otherwise work it over to add
features and the like, in the way that RR's parents/grandparents/etc.
have been in the past.  I haven't been working much in RR until
recently, but now that I have some time I would like to get to it.

Has anybody done much in this regard?  I'm trying to save some
learning curve here.

-- 
On the first day, God created the heavens and the Earth
On the second day, God created the oceans.
On the third day, God put the animals on hold for a few hours,
   and did a little diving.
And God said, "This is good."