Anyone who tells you that flaperons and spoilerons are a bad idea is just a bit off base.
I have roughly 15 planes and each is set up with both. I don't always use them with a particular model but they are always there. I have planes ranging from 40 size profiles for 3D to 120 size and several in between. The flaperons work well for more than landing. Often used to suppliment the elevator in tight maneuvers and for landing. Spoilerons work great for upright Harriers (read no wind rock) I even do strip long tail drags in Harrier using spoilerons.

Talk about alot of fun and a challenge. Try toughing just the tail wheel down and flying like that down the whole runway. This coming year, I have a plane already set up with a top mounted skid so I can try that inverted.
If this is so far off base, I know of 5 pilots at our field that now have both spoilerons and flaperons set up in their profile planes since seeing me drag the tail.

I would highly recommend trying both flaperons and spoilerons, but set them up with small percentages and try them high to see how the plane reacts.