In bug 26282 we discussed the UX and decided it would be better to use two submit buttons rather than a checkbox approach... it proved a little challenging to implement inline with that bug given the time constraints, so here's a bug to record that intention.
Created attachment 114481 [details] Checkbox approach
Created attachment 114482 [details] Button approach
I do like the visual of the button approach. One advantage of the checkbox could be that we have the option to pre-select the checkbox when certain conditions are met. But I am not aware of any right now.