Yes, it does swivel 360 degrees

if you mean the clamp, then yes, although ive not tried it with a bike on, but should be ok.

Yes

Yes, you can also remove the rear wheel and use this stand to clamp your bike at the rear of the frame. After you have fitted new forks, it may be helpful to change clamping position, i.e. clamp at the forks, as this holds everything straight while you align your handlebars.

You are able to clamp the bike by either the front or rear forks. You can clamp the bike by the rear, and then change the forks on your bike, without any problems.

Axle size isnt really a problem, clamp by seatpost

sorry - only just seen this question - it's quite heavy but folds up neatly for compact storage.

yes there are some limitations

BB30 fits as well as a standard bottom bracket. It supports the BB from underneath

I haven't needed to but I think so- subject to space restrictions when you have the bike loaded. Best to check out their website.