I know it is only a small point but I wish there was a way of preloading maybe up to three sets of graphics settings in the sim. For example I can run the Falmouth branch on nearly the highest settings quite smoothly yet on the North Wales Coast it would be like a slide show on those settings so have the have them fairly low. This means, either keeping them on a lower setting which makes some of the older routes looks worse (I always keep scenery density at its highest) or having to change them each time, which means starting the sim, setting the graphics and restarting in 32 bit mode, then closing and restarting again in 64 bit mode, which can take an age. I don't know whether it would be possible to have such a feature, it probably wouldn't be feasible, I would guess.
This thread might be helpful: https://forums.dovetailgames.com/threads/two-separate-launch-instances.22628/#post-133498
When I change any of the settings and I have to restart I let it shut down Then when it tries to start in 32bit it asks me if I will let the program make changes I say Yes but as the box to stare installing DirectX I cancel it and then just start TS in 64 bit Peter