Hi Yaacov, that would be really interesting to see!
Another idea for timeline, that should require very little work for Geni, is to be able to have a persons timeline also include their immediate family's timeline information (not just a child's birth).
Combine this with location/time entry - and timeline would provide a very comprehensive, chronological event description.
I think you should post your Ideas on
As far as I know this is the main source for suggesting geni improvements