The 32767 HP limit is due to how the value is stored in memory.
Weirdly, This is only on Max HP, with regular HP able to go to like… 2 billion. But, with Damage Object now broken, I guess that is irrelevant for now.
Did you post these suggestions to Lord Base’s topic? The FE devs are actively watching that thread for editor feedback, here: A few ways to improve the scenario editor