Since I was one of the people that made the suggestion to have the ability to change the default RTM when printing, I would like to echo some of the comments/suggestions that I have read since it's inclusion in the latest update and add one of my own.
1.  The ability to change and save the default RTM only works for packing slips.  Please expand it to other forms.
2.  The window that asks if you want to make the current RTM the default has the "YES" button highlighted.  Please change this to "NO", so that you have to make a conscious effort to change the default RTM.
 
Right now, if you have the ISTS defaults set up to ask if you are finished printing,  responding "NO" brings you back to the Print dialog box.  I would submit that having it bring you back to the main print screen would be better.  This would make it easier for people to print different versions of a form, using different RTM's.  Another possiblity would be to have "NO-print more of the same" and a "NO- change and print more" buttons.  
 
BTW,  is there any reason that the RTM selection can't be integrated into the main print screen (with the other options)?  Is is because a different program has to be called?