Hello,
sure this is possible and very easy to setup.
- From the motion detector dialog press the button "select the action at detection"
- from the next dialog press the button "Capture pictures"
- from the next dialog press the button "Picture settings"
- from the next dialog press the button "Picture filename"
In this dialog you can select everything regarding the picture filename.
The text of the filename, the output directory, if there should be added the date and/or time to the filename nad/or a number.
The same you can do for the video filename.
See
http://www.crazypixels.com/camuni-manual-capture.htm#filenamedialog