Have you tried the "Make DKDM for DCP-o-matic" option in 2.5.12? Does that do what you want?

change DKDM FILE by
Select Movie Name

for this, fisrt need add a movie , your name movie and upload dkdm file

if you work with a lot of movie this way if easy to generate kdm ,

Process to generate kdm

first - select cinema (add button to find cinema )
second - select date
and then select movie (add buttons to select movie instead of going up the file )

Last - select generate file or send mail

Ah, I see what you mean now.

More-or-less implemented in 03dd6e0.