You can now commit (if yo have commit rights) or file a patch right from
the browser.
See http://oss.ly/2p
To edit the wiki go to
http://code.google.com/p/simal/source/browse/#svn%2Fwiki (I've put in a
feature request to have the edit link added to the wiki pages for
non-committers - that would make it even easier).
To edit the source you need
http://code.google.com/p/simal/source/browse#svn%2Ftrunk
I think this is a great feature, and should make it easier for newcomers
to the project to get started.
Ross