If the radio is in flaperon mode then it appears to you as four channels

As I mentioned in a previous post, one aileron, I believe the elft, gets plugged into the AIL channel on the receiver, the right aileron gets plugged into the AUX channel on the receiver. The radio then gets setup for flaperon and the computer in the radio does the rest

I also mentioned in the previous post the EVO TPS you have (TPS Stands for Trainer Power SYstem IE EVO .455) will more than definitely work with any plane that everyone has suggested with the exception of the Four Star 60 as it requires a .60 size engine. You would be best to go to a local hobby store and purchase the standard propeller thrust plate for it (I think they are around 5 bucks) since the 2oz flywheel on the .455 limits top end rpm to a degree.

Yes, you can use a 2 blade prop on any of the recommended planes

Just a thought, the 4* 40 is really not all that much more difficult to see in the air than the XE2 you already have. It will not be as stable in the wind as the 4* 60 will be but I have flown both and there really is not that much of a difference in the way they handle wind and flying in general