After creating the module, you need to copy/paste the relevant RootTemplate from the Unpacked Main.pak to the Mod's RootTemplate folder. Reload the module in the Engine, and then you can edit the RootTemplate file you copied over and avoid save errors.
Thank you! I'll give this a try!
Edit: Success! I was finally able to change the movementspeed, but I ended up using your mod as a framework... which I should have done from the start, duh.
18.75/10 (5x) movementspeed makes it feel a little weird when you start doing reaaaally slow animations (relatively) - but I'll work on that another time ^^
