What functions do you miss most from hpl2?

[WALP]

I read something about a camera you attach stuff to in the wiki. I also know that with flat surfaces you can add terminals/gui's to like the screens in soma. So if you attach a transparent plane to the camera you can use the ui scripts on it and do an amnesia style inventory. thats one way you might be able to do it, but I think there is very likely much easier ways.