One of the primary uses of stash is a quick temporary holding area for some changes when you discover there is something you need to do first. Such as merge a change, or fix a config file.

In git they've made this work flow quite quick, git stash, make your changes git pop.

In SourceTree though this is made more awkward by having to right click the stash, select apply, check delete after applying, and then click OK.

I think there should be a Stash Pop button in tool bar that simply runs the standard git pop command.