> We don't have any plan to work on this function yet. Any suggestions?

Well, I think there are two possibilities:

1) Replace the current move document dialog (the one with the path text box) with a new dialog which consists of the file browsing part of the insert document dialog.

2) Keep the current move document dialog, but add a button next to the text box which opens the dialog described above and which inserts the result into the text box.

The current move dialog is the main complaint from our customers. It is quite confusing for our customers and it's use is very error prone.