Not sure whether you mean NWN1 or NWN2, but assuming NWN1:

1. No right mouse for turning, but mouse button does the job.

2. There are multiple hotbars. Press CTRL or SHIFT to access them.

3. No, you don't need to open a spellbook each time you want to cast the spell. The more used spells can be dragged to the hotbar, while those used less frequently can be cast using the radial menu.

4. Guess it's personal preference, but I'd hate it if the loot was highlighted all the time. I much prefer holding TAB to highlight it and I'm probably not the only one.

I mean NWN 2

Same things apply.

For both, holding down the middle mouse button and moving the mouse turns the viewpoint.

NW2 uses Z, instead of Tab to highlight anything of interest on screen. I also wouldn't want this on all the time. Lots of games don't even have highlighting and force you to pixel hunt, this seems like you are looking for something to complain about.

Not only are there multiple hotbars that you can cycle between, but you can display extra ones and place them wherever you want on the screen, and/or use mods to extend the main one.

And with this mod, you can set the right mouse button to control the camera, and toggle always-highlighted loot.
https://neverwintervault.org/project/nwn2/other/kornstalxs-hotkeys-nwn2

I don't see anything wrong with the quickcast menu for spells (F key), so no suggestions there, unless you didn't know about that menu and were referring to the actual spellbook. And you can also drag spells to your hotbar if you like.

Your initial post doesn't sound like this will change your mind, though, even if it does address every complaint you made.

NWN2 has a quick cast menu. ('F' key by default) which gives you access to every spell you have memorized.

You should delete this post or something, because you kind of just made yourself look like an idiot. I mean how hard is it to read the manual or look up the controls? Literally every single thing you complained about not being in the game IS in the game.

Was it really necessary to revive a thread just to insult a post made a month ago?

Yes.