It's kind of a pain to sell items. You get your filters setup and then come back to the game a few hours later have you have a ton of stuff to click, then click sell. I suggest adding ctrl+click=sell item and alt+click=refine item as a short cut.
For Vet items, maybe try a leveling formula based on their current level. Maybe (just pulled outa my ass without thinking about balancing) make the formula: vet item level * 0.25 = how many kills to next item vet level and round up the value to get rid of level 1 * .25 = 0. This way vet items level fast at the start but get slower and slower the higher they are. Is 25% a good number? I don't know. But I think the formula in general would work well. Love the game!
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I have seen other people wish for shortcuts like this. I am implementing them in this next update :)