one question about cannons

i ckecked all three tracks with a cannon (farm, fort magma and mines(new version))
in these tracks they are only animated
in object-panel it is set to "objects", "cannon start" and "cannon end" is unused
does it not work with these object-types at the moment???
i also can't choose an object, that i want to have as cannon-ball
in these tracks they are only animated
in object-panel it is set to "objects", "cannon start" and "cannon end" is unused
does it not work with these object-types at the moment???
i also can't choose an object, that i want to have as cannon-ball