A while ago I wrote a quartet (or attempted to) which contained an imperfect cadence in a minor key, specifically i - V. The V chord is simply a triad with no seventh. In the context that I wrote it, it does not feel unstable or create the feeling of needing to resolve to the tonic. Though it naturally returns to the i chord afterward, it feels perfectly stable - in fact I use this cadence as the finishing cadence. Were I to describe the kind of 'aesthetic' qualities it has, I'd say "grand", "heroic" or "momentous" though I realise that this is subjective and dependent on context too.
Another example of this is in the piece of music Death of Walter from the video game Fable III.
The cadence occurs at roughly 0:40 and again at 1:31. If this version hasn't been transposed then the key is B minor and chord V is F# major.
So my question I suppose is: is this simply considered an imperfect cadence or is it a different type of imperfect cadence? I've looked into it a little but could not find anything regarding one that doesn't feel a need to be resolved. Generally descriptions of imperfect cadences give that as their defining quality. Although I'm maybe making a big deal of this, this isn't to say it's an uncommon sound to hear in music - it sounds quite natural and intuitive. I suppose one thing I should note is that perhaps it's kind of subjective; compared to me you may find it to feel less stable than I've described. I've not looked into it so I don't know if what I'm describing could be replicated in a major key. I'm just making guesses but the raised seventh degree in a minor scale to create the major V chord may play a role.