well this is a rather difficult matter...
1: i't wouldnt be fair to vote, theres always the possibility that its 1 v 2, the 1 guy winning, then the 2 voting for their win...
so 1 is no option
2: a certain % would be annoying in some occasions, i actually ran once on a multistar map, colonizing myslef there, and making a fleet, my allies were losing but i joined them soon after with a large fleet, wich i could make without some player attacking me (they were to foccused somewhere else i guess)
if the planet% would have been in effect, i would not have won that match... but i did
so 2 is not a "good" option
now ofcourse, what is the big problem in him not leaving? yes it takes a long time in bombing his planets & such, but if you already won, you can easily make yourslef some boming frigates and wipe him out fast,
some tricks in doing so is moving your fleet to engage his planets, as soon as space-based stuff is gone, leave behind 1 or 2 ships to deal with builders, and leave all bomber ships to bomb the planet
move on like this and you'll be surprised how fast it can go....
if it doesnt go fast, you'll have to wonder, why isnt he giving up? is he defeated yet? i've been confronted alot about peopel calling me an annoying ass, not leaving a game i've already lost, but can you blame me? it's a 1 v 3 match, im losing planets fast, but í'm not leaving tilll im actually dead, theres still a big battle ahead, one where i try to lure enemy in attacking me and possibly even turn the tide.... once or twice i even pushed back hard nough and won ...
sometimes tough, people are just stalling, whatever their reasons might be, for example since the start this guy has been annoying, swearing, being racist etc. (cmm we need an ignore function!!!) he massed as many ravastra skrimishers as he could, not building anything else. he was defeated pretty easily ofcourse, but he insisted on running and colonizing every world he found, it took the 2 of us remaining around 1,5 hours to finaly secure all planets, leaving him immobile.... theres just very little you can do about this, i dont see a true solution to it
probably the best thing to to, is just leave and have the game with your friends, but ofcourse it's very annoying giving a win to someone who actually lost, but just stalls... (even tough the win means nothing... it still doesnt feel right)
a full week of bombing planets.. raagh, now that i think about it... it's nuts... luckely 1.1 made the game so much faster