I've done this a few time without complaints. 4th Ed had a rule that you could use Psychic Powers in Assault, but that's gone for 5th. I think people still think the old way, which is why they say no.
And you're right on the Locator Beacon-- the restriction is the very last line of the description (but it is on the Scout Bikers page). Teleport Homer says the exact same thing (except that only works for teleporting).