Could this hak be added that adds nwn2 voicesets?
https://neverwintervault.org/project/nwn1/audio/soundset/nwn2-voicesets
And could something like this script be added that allows you to control you summons/henchmen like you can your familiars (make them search/sneak/emote/etc)?
https://neverwintervault.org/project/nwn1/script/associate-puppet-code
I already tried to add that voicesets hak a few months ago, and I couldn't make it work for some reason. I'll probably give it another try in the future, but for now it probably won't happen.
Worth correcting that you probably don't want it as a hak, since haks affect only when you load into the server, so it won't do anything for you on character creation. Override however takes part on character creation as well (naturally I tried to make it as an override when I tried, and I imagine this is what caused me issues).
Regarding the scripts to control summons, I believe that summons are really strong already, and not having "complete control" is a good thing. But will take a look at the scripts, maybe something nice can be found there :)