@Abracadabralicious Yes unfortunately. Not sure how to make a mod to increase it.
@Yun I think I can make a configurable version in the future, but it would be much more difficult so I won't be able to make it anytime soon. If you figure out how to compile mods, I've included my source code so you can go in and edit it yourself.

Are the players still limited to 13 maximum heroes or does this increase it too?

Looks good!
Can you make this configurable for everyone via the mod config in the main menu?

I've always wanted to play Senna... Ada as support.
Thanks for this mod!

Great work, gj.