I think the best for IOM is to have just one mode. One single setting and everthing will based on it. Options are good especially for some critical questions like zoom, but a lot of options result in a lot of Chaos, too. And for a small mod team i think it's is just easier to work with one basic.
So if you play IOM you will have the same optimized game settings on every server.
Same movement, same handling, same effects.
One of the worst things of RO2 are the many game nodes (classic, realism, action, custom) and ranked and unranked server for me. The player are split. ...
Of course it has some advantages. Without classic i am sure i would have removed RO2 from my pc 2 years ago. And without IOM i wouldn't play RO anymore. Yes, i am sure.
I really trust in the IOM team and their knowlegde and skills. Maybe not everybody will be happy from the beginning, but at the end IOM will create a really good game.
But again in my opinion there should be only one IOM mode. Or better said one opimized mode. Things could be optional, but everybody need to know it then.