Hello Shane,
With the current version of OnTime 2007, the check in/check out buttons for a Subversion integration were known to not be available. I believe that was fixed in OnTime 2008, which is currently in it's second Beta testing phase.
You can download and test the Beta version of OnTime 2008 yourself and let us know if there are any other ways we can improve the SCM integration.
We also have a forum here in our community specifically for Beta suggestions, defects, etc, in which you can correspond with other testers and our development team.
Let me know if you have any further questions.
Thank you,
Tom Harder
Axosoft Support
support@axosoft.com1.800.653.0024 option 3--'Fear the Bug' Podcast--