After some testing, I can now confirm that the [+] button for Minions and Lieutenants does not, in fact, add one.
Instead, it adds a number equal to the existing count.
The delete button reduces the count by 1, which is the expected behaviour.
As for multiple boost/hinder/defense, I'd suggest renaming the text from "All of the same die size" to "All Minions/Lieutenants in this line", only for clarity.
(Because other Minions of the same die size and name, but in another table row for any modifiers, are not affected).
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One more idea I had about useful functions:
It would be a great help if the GM could prepare a few scenes in advance, and thus reduce setup-downtime during play.
Since all data in stored in cookies (I think this is still true?), a simple way to implement this might be to download/upload the respective cookie as some kind of config file.
I imagine preparing a little library of files for the scenes I am planning, and then uploading them into the page when the moment comes.
What do you think?