Disable "jump pad" via LUA

[DD`]

function player_spawn( player_entity )
	local player = CastToPlayer( player_entity )
	player:RemoveAmmo( Ammo.kManCannon, 1 )
end

Just incase you haven't worked it out yet.

[Dr.Satan]

You also need to edit these to not give mancannon ammo:

-----------------------------------------------------------------------------
-- Grenade Backpack
-----------------------------------------------------------------------------
grenadebackpack = genericbackpack:new({
	mancannons = 1,
	gren1 = 2,
	gren2 = 2,
	model = "models/items/backpack/backpack.mdl",
	materializesound = "Item.Materialize",
	respawntime = 30,
	touchsound = "Backpack.Touch",
	botgoaltype = Bot.kBackPack_Grenades
})

function grenadebackpack:dropatspawn() return false end

-----------------------------------------------------------------------------
-- Capture Points
-----------------------------------------------------------------------------
basecap = trigger_ff_script:new({
	health = 100,
	armor = 300,
	grenades = 200,
	shells = 200,
	nails = 200,
	rockets = 200,
	cells = 200,
	detpacks = 1,
	mancannons = 1,
	gren1 = 4,
	gren2 = 4,
	item = "",
	team = 0,
	botgoaltype = Bot.kFlagCap,
})

Either delete those or change to 0

They are in the base_teamplay.lua.