There's another way, it just isn't pretty.
I have an application on my iphone which can edit ones queue to remove and reorder items, as well as add them to a list. So apparently that is possible.
Regretfully, moving the desired flick to the first position achieves nothing, since the first movie isn't generally the one that is highlighted in the Roku view of the queue.
So the solution, such as it is, would be to move all movies except for the desired one out of the queue to an external database or array, then you can be sure the single remaining movie would be highlighted. The remaining movies could be reinserted later programatically.
Such a solution might as well have capabilities to maintain multiple queues: a kid friendly one, an adult one, an individual one, etc. All queues would be kept offline, with one queue at a time active on the player.
Oh; of course you would lose your saved position in any half-watched movies and stuff like that. That probably kills it for many folks.