Sendkeys does NOT work for everything. In any case..
How did you map CTRL+Q ? If you did it by a windows shortcut, all you have to do is copy the command line used to open the screen and use the RUN command on a button to execute the same thing.
For the nview application itself, you may want to check this:
http://www.dtvforum.info/index.php?showtopic=39689
From the above, you should be able to at least make 2 buttons to switch between a profile and another directly (using the RUN command on each with the desired parameters).