This menus give you the possibility to create some menuitems for your own, you can put some arexxscripts here. The path and name of the scripts you write to the file .arexx which should be in the same dir like ProRen and should just be like this:

rexx/reverse.rexx
rexx:proren/xyz.rexx

This would create two menuitems, the first executes the script in the rexx-directory of ProRen, the second is in the proren-directory of the systemdrawer.