A representative system could be worth considering, imho it'd be an ideal thing to test out the ID and trust systems on. There's likely to be a lot of proposals covering areas that few really give a damn about but someone they trust might and would let them decide on their behalf if given the option.
Absolutely not! With the internet the is no reason someone can't vote for themselves. Once you move your vote to a proxy, that proxy controls the outcome. Dash is the first 'fair' voting system. There isn't a group of people moving vote counts around or counting votes....This is truly unique, let's not screw it up.
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There's lots of potential issues with it, it puts a lot of power in talk for one but that's easily countered by results and in some ways I think that's the better target for voting, not "how much will you gimmie to do this?" but "what's what I've done worth to you?". Pre and post votes make sense too and there's nothing stopping multisig voting, lock it up when it's proposed and free it up when its completed.
What we have works plenty well enough for the meantime though, it hasn't really been explored enough for clear improvement paths. Like the minimum 10% positive, get enough budgets being voted on and that figure's irrelevant, how much is allocable and how popular the vote is takes over.