Senior figures want Mr Cameron to emulate Nick Clegg's Lib Dems, who formally backed the 2010 Coalition deal, a move that was seen to have cemented more party discipline over policy compromises.
The failure of the Conservatives to do the same three years ago has been blamed on a series of Commons revolts by Tory backbenchers.
One senior Tory source suggested Mr Cameron wanted MPs to have to "dip their hands in the blood" by signing up to any fresh Lib-Con agreement.
Graham Brady, chairman of the 1922 Committee of Tory backbenchers, said it was "essential" they were fully involved if their party leader again failed to secure a Commons majority.
"If there was to be another hung parliament and coalition was a possible outcome, then it is important all the parties that might be part of that would have a proper full discussion and would participate in the decision-making process."
Tory colleague Douglas Carswell said: "A coalition necessarily means having to stomach stuff you don't want to stomach. If you've all had a say in it, you are far more likely to put up with that."