Triggering builds using a CVS commit hook has significant advantages compared to
polling, specifically builds are started immediately and the CVS server is less
loaded as it is not being polled constantly.

It would be very nice if it was possible to trigger hudson to poll CVS when
triggered, ie. instead of configuring hudson to poll on a schedule it should be
possible to configure a job to poll CVS when triggered.

I imagine there could be another text field in the job configuration page when
Poll SCM is checked where an scm/trigger-id can be specified. The job should
then poll when an url like the following is invoked (from a commit hook):

wget -O - http://YOURHUDSON/poll_scm?scm=<scm-id>