Do you think that SW should have a down vote and up vote system?

No, that makes sense on a content aggregator like reddit but that's not the purpose of this site.

No... it's still got some of EP's "support site" DNA, I think downvoting would run contrary to that.

No, that would only create more drama.

yes i've wanted to minus heart some posts

Yes.

After everybody is allowed only one account.

The only time those up and down likes will count.

i think that feature would be abused by sad losers with no sense of humour who are easily upset by those who have intellectual prowess.