Thanks for giving it a try! Could you give me a little more info about the problem you saw? We just gave the system a quick test and everything seems to be working. If you have specifics please email me at doug <at> redline <dot> cc.
We have talked about doing this. The problem is that when a developer goes to fix a bug they want to see (at least in our estimation) an exact replica of the state that the bug occurred in. We thought that adding in anything that changes (or anything dynamic) would just be confusing when it came time to repair the bug.
We have integrated with Jira and Pivotal Tracker for now (though we plan for more in the future).
The way that replay works is that we actually take the screenshot from the current dom state (after disabling javascript and all the moving bits). So even if it is a very dynamic site (like the customink.com lab: http://www.redline.cc/bug/152570393#vdb_box_1) we are able to reproduce exactly what the bug reporter saw.