A computer radio isnt necessary, but same as with any model, expo, rates will give you a better flying model. Stall characteristics and stability are similar to the Twist. It is not a trainer and doesnt have any self-righting charicteristics. Its a symmetrical wing with no dihedral, low aspect so it doent damp a lot in roll, i.e. a fast roll rate if you want. Hard to quantify how it slows down and remains flying. Much like a Twist 40. CG of the model will effect that as well.
Any plane this size is not the best candidate for an on-board camera. Additional weight is never a godo thing.
The Hangar 9 40 size Cub floats will work, you would have to modify a little to get the correct fuse angle.
Dubro makes some nice injection molded skiis tha would be perfect for it.
The most unique characteristic of the Tango is the rudder raction. It generates a lot of roll and after you get used to it you can do a lot of interesting indescribable maneuvers with it.
As for simple 3D (hovering etc) it has planty of rudder and elevator authority so as long as you have good power and the skills to hover, its fine. Like the Twist, roll authority in hi-alpha (harrier roll) is not huge. Not like a pure-bred 3D design. Ailerons do decay as the angle of attack increases. No mote than the Twist though.
Hope this helps.