Those are very good points, hadn't considered what'd happen if others were changing the settings.
I'll need to think how to word it, as the stations do not all connect to each other - instead, just like in real life, Waverley connects to Haymarket, which connects to South Gyle and Slateford (although those two don't connect to each other). Perhaps the following?
"All outer stations connect to Haymarket"
(Either that, or I could change it so the stations do all connect to each other after all, but I quite like having the connections the same as the real life train lines)
That, plus the individual bonus links and the change of name for the All Stations Bonus link, should hopefully do the trick.
Will probably wait until the first test game is over to implement these, plus any ideas that come out of the test, but thank you, I appreciate the solution :-)