Many people like to over-generalize. Roadshow is some what linear, which goes with the theme of what you are doing.

- If there was only 1 path of 6 cities -> the game would be completely linear.

- The designers added 3 paths to 3 final cities and have jumping across paths to overcome this.

This makes the game somewhat linear, but not anywhere near completely linear.
A code update could make it completely random, but that would sort of destroy the idea of traveling cross country, which many don't care about. I think it's fine as it is, but see the benefits of either method. It would be great to have the option in the adjustments

Hopefully we can someday get a Road Show 2.0...
- Super Wizard Mode
- Random modes
- User replaceable music! - I would put in Lynyrd Skynyrd to keep the country vibe

Sorry, but this comment doesn't make any sense

- getting 6 million points -> obviously not a mode - nothing started - no timer
- hit shot X for 30 seconds for big points -> YES this is a mode (used in 90% of DMD games)