I'm not really a Vim dev per se, having only made a few minor contributions, but all you need to do to create a patch is to check out the latest copy of the code from Mercurial:
hg clone https://code.google.com/p/vim/
or if you already have a local copy, then just
hg pull -u
to bring it up to date. Then, make whatever changes you have in mind,
and when you're done,
hg diff >my_awesome.patch
will create a patch with your changes. Then just attach the patch to a
message and send it to this list. Bram will review it, and if it passes
muster, it will be published on his next "patch day".
That's about all there is to it. Creating and submitting patches is
easy; the hard part is the actual coding. :) I recommend using cscope
and ctags liberally to ease your navigation of a relatively large C
codebase like Vim's. Without those tools (and Vim itself, of course),
I'd never be able to find what I'm looking for.
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