Hi, thanks for the bug report!
1. Route generation is handled directly by the base game engine. My past attempts to manually tweak or override pathfinding usually introduced way more bugs than they solved.
2. I’d really appreciate more details on this — what specific entities or obstacles (aside from elevated rail supports) are vehicles ignoring or trying to ram through?
3. I did notice something off on turns, but couldn’t pinpoint the exact cause — thanks for sharing your observations! Speed control in convoys is quite complex, but I'll look into calculating braking distances (likely based on vehicle weight/momentum). Also, keep in mind the mod is currently an MVP, and I’ll keep polishing it until it feels right.
4. Copying settings via Shift + Click was already planned, but since you mentioned it, I’ll bump its priority up.
5. This one is tough. The path through gates is picked by the game's native pathfinder; forcing straighter angles manually would cause massive lag spikes (path calculations taking 10+ seconds). As a possible workaround, I might try slowing vehicles down while they traverse gate segments. I'll figure something out.