I've always thought that the sleeper respawn timer should just be the loot respawn timer. That way when the loot comes back so do the guards. Seems like it would solve the problem of zombies spawning in inhabited POI's because the loot respawn timer starts over whenever a player is in the vicinity. The only way sleepers would respawn in the POI is if all players left the chunk for the duration of the loot timer.
It would also give people more incentive to stealth loot a house as a trick on fellow server occupants so that when someone else comes by and kills all the zombies...the joke's on them.
Not a fan of the spawn timer being tied to loot timer idea..
I think 'eventually' we as players, should be able to adjust the respawn rates of:
Biome/Poi/Loot, separately in the settings w/o needing to manually edit the xml.
I like having the biome respawn rate set to every 2-3days, to simulate more zeds wandering into my area and repopulating it, to keep me on my toes.
If they set it to the loot timer, then I would need to wait every 30days(default) till the area got interesting again when I find 5 days a bit much already.
If I set the loot respawn to 2-3days to keep the zeds around more often, then I'm swimming in loot, which I don't like. Because then I can get everything I need in only a couple weeks.
Also:
What about those that want to simulate clearing the world of zeds but still want their loot to respawn regularly?
So yeah, I personally think it would be preferred to have them all still as separate adjustable settings. that way If you wanted the loot to respawn at the same time as the zed respawn you could as well.