You make it sound like the President is just some bit player in this scenario. Other "impacted parties" don't have veto power. Members of Congress generally don't run on a unified agenda (The Contract with America being an exception). The President does. A President Romney will have his allies in Congress drafting bills to his pleasure. The final bill will be modified but it will be primarily Romney's bill.
As Romney showed in Massachusetts, he and his people are very adept at writing bills which can be supported by Democrats and RINOs. If the conservatives in Congress create a problem for Romney, look for him to form a left-of-center coalition and freeze out the Tea Party by rallying Democrats and RINOs which will still make up the ideological majority in Congress.
I see you’re back on your jihad against the Republican presidential candidate. Perhaps the messiah Obama will reward you with 72 Helen Thomases in heaven.
Enjoy!