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I'd love to see this feature too. Most other products I've tried have the option to set the resolution of the remote machine. 

For us, the issue is reversed from OP; We connect to machines with super high-res displays (Apple iMacs with retina displays) and if we connect from a regular HD monitor or laptop, the remote screen is very hard to read without zooming in. 

Ideally, this feature would:

  1. Allow the user to set a preference in the connection properties to automatically set the resolution on connect.
  2. Show a dropdown in the connection window toolbar that shows a list of resolutions, with a highlight on the resolution that closest matches the local machine for easy switching.

This would accommodate both scenarios (res too small or too high) and make changing very easy.