That's actually a good idea, but it could be abused by trolls, @boobs and I will discuss about it.
The comment sticky is a new feature and it could evolve in the future if enough mods from active subs are requesting it.
Mods/owners could block sticky requests/privileges for specific users.
It adds an unnecessary step for mods and if they get flooded with sticky request from alts/trolls, they will eventually disable the feature.
They can choose option 1 or 4, and they will not get flooded.
I suppose the owner should also be able to set a limit on how many comments can be stickied per thread, which would be especially important with option 4.
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