Member Rara Avis
As much as I encourage open communication, I think there are some questions that need to be asked carefully, and usually only after a lot of preliminary conversation has passed (i.e., you've gotten to know them well enough). If someone you just met asks to borrow five bucks, a lot of people feel uncomfortable saying no, even if they don't want to say yes. The question itself creates an unnecessary awkwardness.
If someone has not indicated an interest in critiques, I think we should assume they know what they're doing and respect their decision. Just asking if they'd like to hear your critique IS a critique because it suggests their poem "could stand a constructive, good critique." And it puts them in the unnecessarily awkward position of having to say to no.
I don't foresee using the Critique Message to perform double-duty because it would too easily dilute its already important duty. Nor can I envision a way it could be used that didn't at least indirectly center on critiques. What, specifically, would you want to say or hear?