You can submit poll suggestions / ideas, Yes.
One day, this should mean a better poll-specific interface, but for now, just use the regular story-submission page. It's a bit of a kludge in our system, but submissions turned into polls don't get karma credit, the way accepted stories do -- sorry about that, and (not quite as bad as the final scene in Raiders of the Lost Ark) top men are working on it.
Upshot is that just like other submissions, and position on the page aside, we're going to run polls that the editors think are a good idea, largely drawn from reader suggestions -- that's how the site's always worked. Submit more / better polls? Aye, you betcha, please do, and have at!
Some examples and hints here: http://slashdot.org/journal/23...