We need a way to prevent a user creating an Account from the Deal module (we renamed this Opportunity in our system). 

We have sales managers who will create the Deal and it's mandatory that they link an "Account" to the Deal.  Currently in Zoho the user can type in the name of the account and if it's there they can select.   HOWEVER... if it's not there and they type in a name Zoho will automatically create the account.  Zoho says it will create an account and so the sales person thinks this is okay

The problem is that we have certain mandatory fields required for creating an account and those required fields are bypassed when the account is created this way.

Isn't there anyway to turn this feature off so that if a sale person types in an account name and it's not there it will not create an account and not allow them to save the new deal record?  We are trying to re-enforce the need to create the account first and then create the deal record off of the account.

Does anyone have any suggestions on this?