Hey CJ,
I export the same way the original poster does from a master buss.
Sonar does put a suffix of the buss name on the output file. This does not appear to be optional.
If you export the total output then it does not but then you have control the output level to your monitors from somewhere else.
When monitoring I use the output level to control the speaker volume. That is why I use the buss. The original poster probably does it the same way.
I think he is just looking for some sort of output filename mask definition to allow him to slug in metedata on the export.
Not a terrible idea.
George