Hi, Yegor.
I was a beta tester on v2 and you are right, the Add Task shortcut has a field for the add-to destination folder but it currently accepts only "inbox". This may become available in a future enhancement.
I would just like to point out one of my favorite features of v2. If you want ro add a lot of tasks to a folder you can select the folder, tap the AddChild icon near the lower left, type a task name, hit the Done key and immediately type the next task name and so on. Hit Done twice to finish.
This allows a large number of tasks to be added very quickly. You have to go back and edit for any details (dates, context, etc that were not inherited from the parent.
-Dwight
MLO Betazoid on Android SGN4