Hi Pascal
I've never tried making such small tracks but I can look into it. It'd be helpful to see the file. The mouse wheel doesn't work as long as the web dialog is focused and I don't think I can do much about it.
The signal system is quite old and will be replaced completely. Some signal types can show both left, straight and right will some only can show straight and turn so it's a bit complicated but the new system will contain one model only and the hidden property will be changed on the lights/arrows instead of replacing the component.
I have planned for some time to make the track properties dialog work on multiple tracks but haven't been sure how to do it. I'll keep working on this.
I've actually tested to follow with a fixed camera by changing the source code temporarily and it would be quite easy to implement technically but I'm not sure where to put the options in the UI. The Drive Train dialog wouldn't work when you follow a rolling stock without having the tool activated.
The Balise ideas are great! I'll defensively look into it.
Christina