It would be great to be able to simply select some part templates when creating new layouts rather than doing a copy paste, it would be easier to insure homogeneity and to retrofit certain changes.
Here is what the Layout object tool could become.
Save changes to template could have a prompt asking if the change must overwrite all parts across the solution based on that layout, if not it will request a new name. If so it will ask if objects properties must be overwritten (yes to all, let me select those that must be overwritten, do not overwrite objects properties).
A manage parts templates option could be available in File. A list of the parts and the templates available for each would be displayed, as well as a list of the layouts associated with each templates.