(1) I've seen several variations on depth adjustments; ranging from 2 to 4 or so. I've got a Woods GB48, and it has two, which is sufficient with also having the T&T.
(2)Yeah, I've heard that too. The Woods has a simple pin that drops behind each scarifier to press it against a shelf, with a coresponding notch in each scarifier. The pin is held in place with a clip. Very simple, very easy. Seems pretty reliable.
(3) I have no knowledge of rollover boxes.
(4) ditto
(5) ditto
(6)ditto
(7)ditto
The GlueGuy