Care to cite some sources?
To my eye the easiest way to exploit a two party system is to provide both candidates. The act of tossing them aside can give teeth to the vote and demand better quality. I fail to see any obvious drawbacks to this.
If implemented correctly it would not impact good elections and would drastically affect bad ones. Is that not ideal?
What does that have to do with a vote of no confidence?
Were you reading what I wrote or…?