These flags have reasonable arguments for existence:
- Does Not Block Draft Promotion (see: PHI896, PHI715).
- Build Can Not Restart (see: PHI1093).
- Does Not Prevent Landing (see: T13108, email, various other references).
- Does Not Count At All Ever
In all cases except "can not restart", options "Always", "If Building", and "Never" probably make sense.
This is kind of far afield, but it would be nice for a build plan to be able to list Herald Rules which run the plan. (Currently, there's no efficient way to query for Herald actions which affect a particular PHID.)