I will reply with respect to the STEMsocial app that I develop.
The first of your items is on my to-do list. I already implemented long ago a comment ordering method but I think that here, there is no perfect choice. The third one would be great but this is a lot of work and low priority at the moment.
I agree having the three options you suggest would be great!
Thanks for getting into the trouble to let me know. I appreciate it. well the 3rd one is low priority for me. I usually google and add some keywords most of the time and I get to find what I am searching for in the first page of results. The other two are more important for me. I visited Stemsocial and logged in did some voting. You have done some good work there man. Especially the content you whitelist is awesome. Wikipedia tier good.
Thanks a lot for the nice words. We still have a long way to go (as shown in our roadmap). I do my best with the time I have...