To answer your question of the rossi binding, i BELIEVE that the FXT line is their regular line with a non rotating heel. The axial line has a rotating heel piece, so when you have a twisting fall, if the toe piece fails, you still have the heel piece working. It can be considered a failsafe. Another thing is, the rotating heelpiece allows for a "safer" release. I don't know the statistics or anything behind this, but the twisting heel supposedly prevents a spiral tibia fracture which is "common" with a regular, non-twisting heel piece design. Does this make sense?
As for the bindings in general and your questions about lifters and such, it's gonna depend on your ski and the regulations of the racing league. The higher off you are from the ground, the easier it will be to turn the ski due to added leverage. Thus, a ski with a built in lifter plate and a binding will give you added turning power when compared to a ski without a lifter plate. The down side of this, since most bindings do incorporate a plate into their design nowadays, you're gonna be skiing on a double decker condo. The dangers of this include, more required effort to come out of the turn, ease to lose your knee due to the added leverage the ski has on you as well, and not being able to race due to exceeding height limitations. The FIS i know set an upper maximum height for lifters + bindings + skis to prevent injuries and such...your racing leage will probably abide by these rules as well. So the conclusion? Lifters are beneficial, they make turning easier and also prevent booting out since your boot will be farther from the snow. Are these benefits free? nope...the higher you go, the more prone you are to a knee injury when you fall. You might get disqualified from the race too. There is no such thing as a free lunch
As for bindings in general, all do the same thing. They hold you in when you ski and try to release you when you have a bad fall. Thus, each binding line has different features suited for different uses. I'll try to run down each binding manufac. that i've used and show some details
Tyrolia - The bindings you'll probably be looking at will feature a rotating heel piece similar to the axial bindings. The heel will not give you 180 degree release range, but a 150 degree release range. It is their belief that when a twisting fall occurs, it doesn't occur on a flat plane, so they have taken a 180 degree release out of the heel. Their toepiece will release at 180 degrees, though. Their AFD (anti-friction device) which prevents the boot from sticking to the binding in case of a fall, is a cat track which grips the boot once a twist starts and carries the boot off the binding. It works very very well and is made from a molded piece of nylon, so there are no seams for it to really break from. The tyrolia also features a free flex technology on their plates. THe heel will move front and back depending on how the ski is cambered/decambered. This also helps prevent booting out by relieving front and back pressure on the boot when the ski flexes. Promotes natural flex of the ski. Also, i believe the tyrolia is the most elastic of all bindings. So, if you're in the bumps, you can move aroudn more in your binding than in, say a salomon, and not be ejected out. Overall, an excellent binding. Rotating heel is named Diagonal Heel, so that's how you'll know you've got the right series of tyrolia bindings.
Salomon - uhm...i don't know what bells and whistles this binding has...i think it's the no frills binding. It has teflon pads as its AFD.
Marker - another set of great bindings imho, and the ones i currently use right now. The MRR is the one with the rotating heel/turntable heel, but aside from that, the MRR, M9.2 and M8.2 i believe share the same toepiece. There is a rubber dampener underneath the toepiece and also features a comshock piston which prevents the toepiece from releasing due to sudden impacts. The binding will release if there is constant force applied to the toepiece tho, so that's their method of preventing booting out. Their afd is a stainless steel pad, which grips the boot to slide you off the binding. I don't know much about the standard heelpiece, but the turntable heel is kinda cool.It's not mounted directly onto the ski, so it promotes more of a free flex than a binding bolted directly onto the ski.
Other bindings i'm not too sure about so i won't comment on them. There are other bells and whistles on the bindings such as things to change the stiffness or camber of the ski which really do work, but also weigh a ton too so i would probably stay away from those. If you get a ski with a built in lifter, then you'd be better off getting the binding witl all the bells and whistles on the marker since those have less lift.
Hope this helps somewhat :|