I think that we should have more visual effects as it could make the sim way more realistic like the smoke coming off the tires or the mist on the wings during high g scenarios like pictured below
In my opinion a twin otter would be great as it’s a small island hopper aircraft with a nice cockpit and small cabin. Plus some Air forces operate it and some airlines. In my opinion it’s just a nice plane in general and I think it would be great to see it in the sim!