RE: Ailevators vs tailerons?
Stumax,
Not sure I correctly understand your terminology or exaxtly what you are contemplating.
Tailerons are pitch and roll control with the horizontal stabs. Works well with some designs but roll control may be ineffective at lower speeds...at least that was my experience with a Yellow F-18 single, ducted fan.
Ailevators (or elvons) are applicable to delta wing aircraft and single control surfaces on each wing act as elevators and ailerons. These work just fine on deltas but don't work well on conventional aircraft because the pitch moment ("elevator") is too close to the cg. Your design has a delta wing planform but is not a "delta" because of the conventional stab arrangement. I don't think ailevators would do well.
Flaperons are simply when the ailerons are drooped to provide some "flap" effect. My limited experience with them is they tend to be touchy and not particularly effective.
The best control solution is stabs, ailerons and flaps but if you are trying to eliminate controls on either the wing or tail, I would go with tailerons.
Craig
PS: I also like the look of your design. From the leading edge of the wings back it reminds me of a Mig-21.