Missing features

Hi,
missing features for us:

1. several times, happen that I remove accidently some elements or I do some modifications, but I don't find the way to repristinate or to cancel the modification/go back etc.
2. the print feature is not available
3. I cannot copy or shift specific tasks from a project to another
4. when I assign an activity to Team it is no way to define specific time for each member this impact the work load for each one.
   best regards
   Mohammed