The flow fences on the wing of the Mig15 should tell you something about the effects of swept wing design. If you have flown on a Boeing or other commercial jet you will probably have noticed the vortex generators all over the wing, especially just forward of the movable surfaces. True also of the vertical and horizontal stabilizers.
Sweeping usually has more to do with the supersonic movement of air over the surfaces. Dihedral for inherent stability is not usually necessary due to computer control during flight. Power boost has eased the burden of moving surfaces at high speeds and made it much more usable for computers which have redundant systems in place. What the effect of sweep has on model aircraft design usually reflects high Reynolds numbers which most everyday sport flyers usually don't mess with.