This type of thing has been on my mind very much of late, the link at the bottom is one Alfred started way back in the day and for reference only.
I frequently add new record collections to a new empty database before input into my main database, why? - well it's a cheat on the source entry process for me to speed things up beyond the current memorize and paste functions which are individual event by event operations. I am fortunate that I can multicite the multiple facts and persons which come from the extraction of a new record collection outside RM but the bulk of users are snagged by this limitation, the present RM MultiCite applies only to the individuals and not the facts which would be desirable.
Alfreds original post was suggesting additional options over and above the Gedcom Source entry options available for application to People or all Events on Import, this would work well with my current model of working where all new entries and events stem from the same source collection, MultiCite within the Edit person screen or MultiPaste would also be a beneficial addition.
I am well aware that RM8 is well in the can by now but just wanted to express my opinions regarding this current time consuming process, Renee has declared both on this thread and the old one linked below they have been added to the enhancement request list.