No idea why someone hasn't made this yet, but it would be awesome if someone could make a simple mod to queue up 100 units with something like CTRL+SHIFT+click.
I can't help but feel that this requires interaction with the server that might not have been exposed yet? Just a guess.
I think I saw a value in the js that is responsible for the 5. However I did not investigate further and I may be wrong. Might actually be worth it to look into it when I am home in an hour.
https://forums.uberent.com/threads/rel-modbatch-52168.50897/ No extra key though, it just replaced the 5 with a 100. Who needs 5 currently anyway?