As long as you use a chain was and not lube you should get no fling.
Meh. You're gonna get chain fling pretty much no matter what you use. Thankfully, the small countershaft sprocket being where it is, most of it will just get stuck to the engine case right there.
It think the main reason it's on there is, as mentioned, to make it more difficult to get stuff stuck in there.
I'd be a little bit more wary of outside debris getting in there and doing bad things to your chain and/or sprocket. A case saver wouldn't be a bad idea, but then, they pretty much never are.