for a variety of reasons (i'll enumerate a few scenarios) a small delete UI element eg. 'x' at the top right of the 'add(itional/ed) stop' box would be highly useful...

1) I often will add a stop on a regular route i take. The reason i add the stop is because the default route Waze gives me does not take the exit/interchange i prefer, and Waze does not 'learn' my preferred route over time. But i always want to take this exit which is not offered to me. So that i don't miss the exit, i add a location just off this exit (which sometimes i go to, and sometimes i don't as it's just beyond the next road i want to get on). So... once i get off the exit, if i just get on my next road Waze harrasses me endlessly to turn around to attempt to get me back to the 'stop' on the route.
Yes-- i can delete the entire route and reselect my original intended destination, but i'd rather just delete the stop, and continue on my way.

2) sometimes i 'add stop' multiple times iteratively, as a way of seeing which of the restaurants offered, or gas stations offered, are REALLY on my ongoing route. While it's nice that Waze offers the ability to see nearby 'xyz', it doesn't do a great job of clarifying which are actually on the ongoing route. So to verify which one of several works best i often want to add a stop, and then remove it, iteratively.