@Peter-Cheung Realised the other (main) question was a 'continue route from here' button. My way over that is in the Connected App 'Journey Settings'. Increase the 'Max break time per tour' to a longer period. I think the default is 15 minutes. If you set this to the longest break that's normal. Say 30 minutes, then it's almost impossible to not continue from last point, as it's actually still 'recording'. As you'll see on the home screen if you come out of the route. I did have it on 1 hour, but we seldom stop that long and it's still running (phone battery) for an hour after you're off the bike.
This also stops you having multiple separate 'tracks' recorded in the connected app for a days ride.
HTH