Yes, unfortunately there is no way for modders to configure the unit's speed from the mod script.
It can only be done manually within the game's character customisation.

why can't you set the speed to 15? is that related with the dev ide?

Great to see you still working on this game, thank you

💥I have set up a Discord server so feel free to join where I'll be sharing updates regarding upcoming mods and YouTube uploads.

The aim is to build a community and improve my communication with you all. 🫡

Invite link: https://discord.gg/RB63sHFedQ