A while ago I changed the script to always add a ‘-SNAPSHOT’ on the development version (Try to enforce -snapshot on dev versions · openmrs/openmrs-contrib-bamboo@9542061 · GitHub). So, it won’t cause the same mistake again 
Hum, no, sorry, I cannot really modify that screen when overriding plan variables. We have the plan description below the plan name, but that’s about it.
I can always print things on the logs, but reality is that it’s a little bit too late and also it not so visible.