Currently when creating an allocation rule you can select the source based on main account, financial dimension etc

Some companies create a financial dimension (like a dept code) for values to be allocated which are the pro-rated to other departments using allocation rules. Many rules may currently need to be created to define multiple main accounts. It would be useful if the source could be just a financial dimension across all or a range of main accounts and the destination allow an option of as per source for the main account and then allocate the percentage etc based on the defined financial dimensions i.e department code, with the other financial dimensions being "as per source" in a similar method to the allocation terms.