OK. After all your advices, I finally decided to download it, and installed it in my BAT (on both TGA and WOW). Works perfectly on the 2 "chapters" ! very nice plane for slow speed, and manoeuvrable (but not very good in vertical maneuvers, because it is not powerful).
I even tested it in a mission of my Swiss campaign (rescue of a Swiss piot that had to land in France after a Me-109 failure), replacing the RWD-10 used in this rescue mission by this Bucker, and it worked really like a charm ! Even landing on a little countryside road is easy. Of course, when I had 2 Bf-109 searching for me, I had to evade from my way, and fly very low and pray for the Swiss 109 to find the German ones before they saw me... but I managed to escape them and land at my base safely, after acomplishment of the mission (with a landing in foreign territory).
So... adopted !