Some users with the STOP_BUILD permission may accidentally hit the Stop button. Adding a confirmation modal with the following details would both mitigate accidental stopping of the build as well as eliminate some confusion or frustration for those new to configuring Quickbuild:

Are you sure you wish to stop this build?
[Note: Steps in the workflow for this build are set to "Always Execute" and will not be affected by the Stop action:
{list of steps set to Always Execute}
For more information about stopping build, please see {link to version-matched documentation for Stop function} ]
No, Yes