I flew my limbo dancer for years nd i taught me a lot of my 3d.
1) like most planes with enough elevator it will harrierm but not that well. i seem to remember mine was very wobbly inverted also but i probly built it skew. Also with the thick wind it is tricky to get it slow enough to stall the wing and achieve a genuine harrier.
2)Brilliant for learning to hover thats how i learnt and yeh torque trolling is pretty much the same thing.
3)Ive alwasy bin cr@p at these so i cant reely judge but it probly wud in the right hands.
4) YES this plane does the most awesomeflat spins.
5) No theres simply not enough side area and if u achieve it u wont be able to maintain it.