Interesting idea. Should be pretty easy to implement. Only issue will be how long to run the stop command run. Otherwise it would be possible to hang the switcher if that command gets stuck.
Hope to get to these in the next few days. I'm still catching up around the house from having the rest of the family sick (nasty bug that I've fortunately avoided so far). I've also seen some suggestions on other threads where I originally announced (with a link here) the program. One I'm interested in trying is an auto-donate feature where a user can donate a percentage of their time mining to the donation address. I've got some ideas of how to do it, and it will be optional, that may make it in when I have a few hours to dedicate to work on this.
Another idea that I thought more of the programmers should give a try to is a 'tip calculator'.
If you let them enter a number, and have it estimate their BTC earnings, giving them a specific idea of a number.
I do like the idea of the auto-mining to your address for a percentage as well, and if you allow the user to change that number as well I know I would use it.
Now if we can get you and Bombadil's profit calculator together so you can profit switch between any coin, on any pool the user configures you would be on to something amazing.
