[plt-scheme] Availability of the prompt in the interaction window during debuggingsession?

Is it possible? For example, for ad hoc testing, changing or only 
displaying of complicated dynamic structures in the middle of the 
debugging session. Now, all instances of the interaction window lose the 
prompt during debugging.

If not, could I propose addition of that feature? It seems consistent 
with Scheme philosophy and PLT goals, and if debugger is not more 
complicated than I imagine, quite reachable, actually, almost here.

Thanks,

Kazimir Majorinc