Other triggers?

[zserge]

Won't it be more useful to let the developer choose other triggers (or a combination of those), such as:

• Number of lines in the diff
• Number of files in the diff
• Time spent modifying a file after it's last commit (e.g. I edited a line and then forgot about that change)

Personally, I like to press :w very often. To me lines in a diff or time would be a more meaningful trigger.
Also, I understand it's github here, but probably the plugin should also support other VCS as well (hg, svn)?