This application is relatively new and it has already been through multiple improvements. I believe that quick entry is part of Jesse’s plan as he has mentioned , but it might take some time to get that implemented.
Would you mind explaining a little bit better what do you use TaskPaper 3 for? I mainly use TaskPaper to keep track of meetings where there are several people involved doing different jobs. I also keep track of some ToDo’s and what I do during the day (mainly for record keeping). I honestly couldn’t go back to TaskPaper 2, but if you miss the quick entry box, you should stick with TaskPaper 2 for the time being.