I think Hodgson has a better idea how to use him than Martinez does. Not even bothered about the criticism that gets. Yes he picks rubbish players ahead of him, but when he does play you see him either one of the deep lying two in midfield (a position Martinez barely ever trusts him with) or in a midfield three with Lallana next to him and Shelvey behind him. What you don't see is what he often does for Everton where he gets lost between a midfield two who can't find a pass to him and Lukaku.
When Hodgson does play Ross he trusts him to run the midfield properly from deep. Martinez never trusts him to do this (he doesn't trust anyone but Barry/McCarthy). Rather than a completely free role I think Ross needs responsibility and a set position to become the player we know he can. Just being asked to float between the lines and belt a wonder goal now and then is not the best use of his talents. He should be running our whole team, instead he's often just a very classy accessory at the top of it.