Append status message using service message

Hello!

I would like to know if it's possible to append a status message using a service message. It is possible if using the TeamCity.xml file, however I'd prefer to do this using a service message. Something like this:

##teamcity[buildStatus status='<status value>' text='some aftertext' action='append']

The action part is not documented and I have not tried it. Does it work? If not, is there an existing issue where I can vote? :-)

Daniel