Only because Rooney spreads play, it doesn't mean our wingers/full backs have to cross it. Why not come back and try and create openings? Switching play effectively as Rooney does, drags teams across the ground and tires them out. It can also create a 1 v 1 situation. If we had more effective, tricky wingers, I don't think this would be and issue, in my opinion.
If you watched the Arsenal vs Bayern game the other day, you would have seen how many time Toni Kroos switched play. According to whoscored, Kroos made a total of 22 long balls. Now, this doesn't specify where these passes were, however, if you go on squawka, it will clearly show you how many times Kroos switched the play for Bayern. Xavi, to a certain extent does the same thing for Barca, mostly finding Dani Alves.
I just think it's a bit naive saying Rooney's the reason for us crossing the ball. We, as a team, need to change our philosophy, in my opinion. When we get in to the wide areas, lets not always think about crossing it. Can we try and work it back and play intricate passes through the middle? If that doesn't work, we do the same thing. This is exactly what teams like Bayern and Barca so. It tires teams out so much as it's such a killer on the legs.
Having said all of this, I would personally play Rooney as a false no.9. I personally feel he's got everything to be a sucess there, and has shown that with the very little time he has got to play there this season. More notably against Leverkusen.
My team would be something like:
De Gea
Valencia - Smalling - Jones - Evra*
Carrick
Cleverley* - Kagawa
Januzaj - Rooney - Mata
Kagawa and Mata to interchange with each other. Similar to how Fabregas and Iniesta do for Barca.
* Players we should be looking to replace next season. I would still have them as squad players, though.