Regarding numbering systems that are done automatically, I was so disappointed in Family Tree Maker (FTM) 6 because there is no such system that I could find. (I had had years of successful work with Brother's Keeper which automatically assigned a person's number, in addition to the Ahnentafel number that you described.)
The main reason I like the automatic numbering system for people (not events like marriages, deaths) is that I could differentiate by their numbers between two or more people of the same name. It made it faster when I wanted a certain man and had to merely type in his number to pull him up on the screen. That way, I rarely had problems with adding wife or children to the wrong man. -- Just another way to judge a genealogy program.
Thanks for explaining how the lack of a RIN (as in Record ID Number in PAF Personal Ancestral File) in FTM impacts your data entry.
With regards to Legacy Family Tree (LFT) our friend Geoff Rasmussen recently posted "Understanding Genealogy Numbering Systems, A question about genealogy numbering systems was recently posted to the online Legacy User Group: What is the difference between Register & Modified Register Reports?
When printing a descendant book from Legacy, there are two possible formats - Modified Register, and Register. These options are found on the Descendant Book Report Options screen." For more info see the full article:
Please note that Legacy's descendant charts also have different numbering systems from which to choose:
de Villiers numbers
Happy family tree climbing!
Your friend in genealogy.