I have them set-up on all my two-aileron-servo models.

Some models benefit from them; some turn nasty when they are deployed. If you are not accustomed to using your rudder on landing, I would be VERY careful using them on a warbird-type model, due to the afore-mentioned possibility of tip stall. IOW, if you use the ailerons to correct a directional wander instead of the rudder, you may over-control and induce a tip stall.

Having said all of that, all my models are sport/aerobatic types. Most have flaperons enabled; I cannot remember the last time I used that feature on any of them. It is just a non-issue for a normal wing loading. Now, if you're flying one of those 27-ton-per-square-inch scale warbirds, such as are popular at my club, flaps are just about mandatory. REAL flaps, as opposed to flaperons.

I think you're doing it right; set them up, experiment, and decide. You can always inhibit the function.