[plt-scheme] The Stepper

I've been kvetching from time to time for a couple of years that 
DrScheme's Stepper only applies to the Definitions window; there's no 
way to single-step an expression you've typed in the Interactions 
window.  It feels much more natural to me for "single-stepping" to be 
a mode, orthogonal to the question of whether you're executing a 
batch of expressions in the definitions window or a single expression 
in the interactions window.  So Saturday night after the TeachScheme! 
workshop, I started writing up a possible specification (state 
diagrams and all that) for how I think the GUI should behave with 
respect to single-stepping.

So here's my question.  Is the Stepper about to be replaced by 
something rich and strange, perhaps based on MzTake?  If so, is it a 
waste of my time to specify how I think the Stepper should behave?  ( 
I suspect that even if the Stepper is replaced, it'll still need a 
beginner-friendly interface with some resemblance to the current 
Stepper, and that should probably be independent of which window 
you're executing from.)
-- 
                                      Stephen Bloch
                                   Math/CS Department
                                   Adelphi University