GoranM, let me ask you something not related to the DC3, but to all addons in X-PLane, including yours.
Where does a developer expect users to set their Artificial Stability and Linearity for the controls? I read that you should set 25% for both, is that correct?
I of course am not Goran, but since he has answered your question, perhaps I would be allowed to put in some of my thoughts on this subject?
Pertaining to linearity, and stability augmentation found in the joystick and equipment section, the default is 0% stability augmentation and 25% linearity, null zone is 0%. However I feel these settings depend on your particular joystick/yoke and your personal style of flying. If you fly a light and quick plane like the Bonanza F33A you probably would not be amiss to keep the default settings depending on your controller. If you fly a heavy plane one might have to increase the settings. The null zone settings are important too. By increasing the null zone settings one can make the aircraft feel heavier, at any rate that is what happens for my particular yoke. I fly the CH Flight Sim Yoke, which is quite old, (one of the first USB controllers to come out), so probably that has a lot to do with the settings. For the DC3 and my yoke I find that by setting the stability augmentation setting to 50% and the linear controls to full linear and the null zone to 35% the DC3 feels to have about the right weight and flight performance. If I leave these settings at default, this yoke is so twitchy, just the slightest movement will cause a drastic change in aircraft attitude, my CH pedals which are of the same vintage as the yoke is even worse!! For the pedals I have stability augmentation full right and full right non-linearity.
Some people scoff at setting the stability-augmentation at all and brag constantly they do not use it, in my opinion there is nothing wrong in using whatever one has to use to get your equipment to work the way you need it to work, and to get your aircraft a reasonable feel to it.
I do wish there were separate null settings for each of the axis, I could probably decrease the null zone for pitch and roll and increase slightly for yaw, however it doesn't do too bad with what we have now.