Probably something a few people have already managed to mention, but...
I haven't played a lot just yet (my controller batteries died and I forgot to charge my second pair >.<) but what has already managed to catch my eye is:

- More locomotion options.
First of all, the current way of teleporting around the room is a little bit uncomfortable. What I mean is, right now in this game you have to hold your controller like a TV remote to point at the location you want to teleport, this tends to feel awkward especially when carrying items around. Many other games do that in a different way I can't precisely explain, but the easiest example is probably SteamVR Home (see screenshot[user-images.githubusercontent.com]).
And second thing - personally I'd prefer free movement with an analog stick instead of teleporting.

- Tossing items around hands.
Would be nice to be able to move items to an opposing hand without having to drop the item on something and grab it again.

- Calculator's broken?
When I tried to input a number with decimal places, the calculator just stopped working - I pressed "," and it wouldn't let me input any other number until I pressed AC.

- A clipboard to take your notes in
Unless I missed something, the only ways I noticed of writing anything down is either on the blackboard, or with a pencil on a piece of wood. Would be nice to have something like a clipboard to write down your calculations etc.

- An ability to freeze/suspend items (especially measurement tools) in the air
I think that would greatly help with precise measurements.

I'll probably give it another shot once my batteries are charged :^)