I think the same goes for grenade-frequency.
Sorry to bump an "old" topic, but I'm having the same exact issue, this topic is still on the front page, and the solutions posted just don't work.
I've tried negative digits, and the bots still throw grenades. I tried removing both the part after the equal sign and the line altogether, and then Soldat just doesn't load the bots. (They appear on screen but do not remove or respond in any way, acknowledge waypoints, and even lose their name.)
Does anyone have an idea? I'd think the two bot creator's "0%" grenade frequency would mean, well, 0%, but it doesn't.
The only semi-solution I can think of is just setting the starting grenade value at zero and have people rely on grenade kits for supplies. The only problem with that is the grenade kits don't appear on my maps.