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.
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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.)