You can dramatically impact participation in any meeting or presentation.
Do You Want A Lot of "Give and Take?"
Offer up your idea while your seated and stay seated.
Sure, your big idea contains a lot of forethought and preparation. But if you genuinely want spontaneous discussion, kick back and let things flow. Sitting down puts you on equal footing with the rest of the group. As a result, you're a lot more likely to hear the pros and cons, agreement and disagreement, refinements, and spin-off ideas.
Do You Want to Emphasize Importance?
Not you...your idea.
Think about this: when someone "rises to the occasion," the rest of the room settles back and concedes the floor. The dynamics shift from an informal discussion to something more critical that says:
"I have an opinion on this."
"I'm prepared to support it."
"The issue is bigger than the normal agenda items."
You can have it both ways
If you want to put your stake in the ground with a stand-up mini-presentation, go ahead; then, take a seat and ask for discussion.
Shifting your physical presence can go a long way to learning how to be influential in the right ways at the right time.