Have a look at the "select by pin count" script that comes with PADS. It is almost what you are looking for, but with a minor change it can do what you want.
Try enabling just gates in the Selection Toolbar, enter R* in the text box and press enter. This will select all the reference designators matching R. You clan also click the drop-down arrow that appears to see what is in the list of items that was selected. If you are just opening Logic, make sure to manually select at least one item before performing this procedure.
Another way is to select certain components are in PADS Layout go into Find dialog and select either Ref. Designator and select "R"; select R1, 4, ,9,12 in Action change to Highlight. Another way is also be in Find and select either by Part Type or Decal.