It would useful to be able to define clean-up steps/post-conditions for keyword tests. This could be implemented as a new test step section at the bottom that always gets called regardless of whether...
it sounds like you are describing an event handler to me. It's my understanding that there is already a similar development underway, where the OnTestCaseStart/OnTestCaseEnd event handlers are getting revamped so that you can utilize them robustly as the type of setup/tear down scripts you are mentioning. this is due for 14.5 release (as far as I'm aware).