Post your undocumented tips here!

[Bragan]

Hope this doesn't constitute spoiling 

I haven't found either of these in any official documentation, but they're shortcuts that could really speed up certain things, especially crafting and smelting.

CTRL+click picks up a whole stack
SHIFT+click picks up one unit from a stack

If you guys have any other undocumented tips, please post them here.

[Tuxide]

Posting how to use the user interface isn't considered spoiling.

[Candy]

RP Tip: Play with another player for at least two days worth of sessions before you make any big decisions about your IC relationship to each other.

I don't mean this in a negative way; it's just that it can help your story to make a little more sense if you find out each other's backstories and such. Of course, it can also be fun to unkowningly have your goodie accidentally befriend a villain, as I learned first-hand XD

It also lets you take stock of their OOC habits (do you want your character to be BFF's with someone that never/always starts OOC /tell conversations? Do they have a different idea of how fights should be played out than you?), which can really help your roleplay go smoother in the long run.