[graphic-forms-devel] input requested: adding a REPL to the library

I'm thinking about adding a Lisp listener to Graphic-Forms, and was hoping to get some input from you all. Do you think it is:

a) a "must have" feature if GF is to be taken seriously

b) a "nice-to-have" feature that you could live without (note -- thinking of the availability of SLIME or commercial IDEs as I write this)

c) more important to make sure apps built with GF have the right building blocks for a listener, rather than bundling one directly with the library proper

d) a complete waste of time

???

Thanks in advance.