Of the two options, the second is better. I had thought of doing that, but it was my understanding from reading the convention that it would be outside of what is desirable. That will be easy to change on my part and will solve my immediate problem.
In the long run, I think the design should include "part of speech", "gender", and "special properties" at the top of the word frame. These appear on the "edit" page but only "part of speech" appears in the word frame. The Russian verb aspect would fall nicely into "special properties". I realize such a design change is a big pain, but you did ask for feedback.
You are absolutely right that the other fields such as gender and special properties should be more visible during learning; this will happen, hopefully quite soon.
It is another question as to whether and when they should be visible during testing, as they sometimes give away the answer. The "part of speech" field is visible during testing, so that would be the best place to put the verb aspect at the moment. I will update the conventions accordingly,