Hi Vivian,
Really sorry but we haven't been able to get to it.... we're planning on having a Report Release soon where we will make many improvements to LoadUI reports! This issue will certainly be included in that release, but unfortunately we still do not have a date for that release.... hope to count with your comprehension.
In the mean time, wouldn't you be able to add a little script in your build system that renames the report file to whatever you want it to be so TeamCity will pick it up later? What build system are you using?
Regards,
Renato
SmartBear Software