The problem is, the new Hack7 has become an only dialog & text editor. So, to edit the Field scripts, you'd have to use another version that has some problems. It will sometimes destroy a "hand choice" in the area you alter (for example, I once edited an event in the Shinra Mansion, and consequently couldn't recruit Vincent anymore since the lack of a hand cursor kept me from choosing "still open the safe").
I guess that while we wait for a new program, the solution would be to figure out what values to edit by using an older version of Hack7, then close the program and do the editing with a hex editor.