Currently, you have two options:
1) poll cvs
2) manually refresh....

What would be nice would be to provide for a URL-based triggering of the CVS changelog retrieval.
You want a simple url you can simply do a http get (wget) - which can be called by a CVS commit script (ala CVSspam).

For security purposes, you might want to limit the http calls to the server specified in the cvsroot.
It cant require any credentials - otherwise you would have to put them in cleartext in the commit script...

You might also want to expose it via SOAP.
That way we can register a plugin in Fisheye (which is already detecting CVS changes) to call into Jira on cvs commit...

Our CVS server is quite a powerful machine - but it is getting hammerred enough by Cruise Control instances polling - it doesnt need more polling from Jira