Problem: "overwrite the recording"
That is if you just use the modelname (or something like that) as the filename only.
You can find here an example of a command line that fix this problem by putting date and time also in the filename:
http://stream-recorder.com/forum/sho...0&postcount=59
Problem: "no record private or group"
As far as I know that didn't work since some time now. Just look at the begin of this thread and will find the statement "A shame you can't download private shows anymore", and that was Feb. 2012!
You can't even record shows anymore if there a password on the chatroom and you don't know that password. That is since Aug. 2012.