I would like the Short Stirling, it would be great for the early and mid-war arenas but it really doesn't bring anything to the table that other more capable planes do like the Lancaster or even the Mosquito.
It was only capable of carrying a maximum bomb payload for short distances only, think under 600 miles. For long range missions into Italy and Germany, it usually carried a 3,500lbs payload. Because of the way the bomb bay was designed, the largest bomb it could carry was a 2,000lbs bomb. It's thick wings also gave it very poor high altitude performance, so much so that majority of the missions were flown at medium to low altitudes. One benefit though was reported about the thick wings, pilots supposedly reported that they were able to out turn the Ju88 and Bf 110 night fighters they encountered. After 1943, the Short Stirling was almost exclusively delegated to secondary duties like troops transport and tow plane for gliders.
Having said that, I think it still can have a little niche in this game as an early war bomber in the early war arena and, if it's possible, in the late war it could be given the option of being able to transport troops. The Mk. IV was used to drop paratroopers and as a tow plane and was armed with a tail gun and was used to drop British airborne troops and tow gliders during D-Day and Market Garden. It would give another airborne troop transport and one that had some defensive capabilities.
ack-ack