If you know C/C++, I'd suggest you write your own physics from scratch. It's been a long time since I used 3DGS, but I remember how disappointed I was with ODD physics. I should have listened to the 3DGS-experienced guys like darkinferno, when they told me not to use it in the context of my testing project. It worked fine for things like bullets, crates, and simple moving objects. It was absolutely a nightmare for vehicles, avatars/characters and the likes. If you use a physics-object for a player, it's most likely he's just going to fall over a lot. Trying to implement complex vehicle physics and flight physics was even worse. I soon discovered, there was no existing physics API which could do what I needed it to, except proprietary ones that the developers would not sell (like IL-2 Sturmovik's engine).

There was also no way of just "not using" physics in my project. It's a basic requirement of a simulation. Mimicking physics in Lite-C also was a poor solution for our project. It's a beautiful and elegant scripting language, but simply lacked the raw, low-level, turbo-charged power (and speed) we needed. That's when I had to face it; "I've got to create a new engine, oh boy!". So, I did. It's not 100% finished, but for a realistic war simulation like ours, I can't think of anything on the market which will hold a candle to it on completion. And the cool part is, if you know C++ or C#, you can probably implement physics every bit as good for YOUR game (provided you know what you're doing).

So, if physics are as important to YOU as they are to ME, you should probably do the same thing as me. I program in C# 99% of the time, and the code runs every bit as fast (and sometimes faster) than my first mirror implementation in C++. If your heart is set on 3DGS, which there is NOTHING wrong with (it's a great engine), you can use C++, or get the C# wrapper and make a new physics API. You will be happy if you do. It's NO fault of Conitec's devs, but ODD was just unsatisfactory for us. And I think you're in for a LOT of disappointment and headache trying to make physics based players or anything beyond simple physics. You can't even mix direct movement with physics in ODD. In my implementation, direct movement simply overrides the physics if you set a bitflag, OR has no effect if it's == 0x0. So I can force particular types of complex motion when it is so desired, with no need to disable/re-enable physics (which is slooooowwww). You can also mix bitflags (^= or |= operators) to blend direct and PE motion for crazy effects, like pseudo-magnetism!

If you have questions about doing it yourself, you can always pm. I come around at least once every couple days, since I still love the community! <3