I've been thinking.
In iocaine 4.x, I will not implement per-server initial-seed. I don't think anyone ever used it. I will also change the default seed to be time-based: when iocaine starts up, it'll set the seed based on the current time (chosen so that a new seed would be chosen every 67 hours or so). I might make that configurable too.
In practice, this means that iocaine will choose a time-based seed on startup, and if you restart it within 67 hours, that seed will remain the same. So if you restart it every week or so, it'll have a different seed, and will provide different garbage. That's a change from the iocaine 3 default, where the initial seed was always empty, and thus, the content never changed, unless the seed was also changed.
The syntax will be like:
initial-seed "string"
initial-seed file="/path"
initial-seed from-time="67h"