Some of the keys can now be rebound.  These can be found in the settings screen under the controls tab.  Eventually all keys and mouse buttons should be customizable 
- W, A, S, D - Movement
- Left mouse - fire
- Right mouse - zoom
- Middle mouse - use item (if applicable - currently only the spawn point)
- P - power down for repairs
- L - return to loadout screen
- ~ - show console
- Enter - Show chat/send current chat line
- Shift + Enter - Team chat
- Tab - Show scoreboard
- F12 - Take screenshot.  These are currently stored in tga format in the .coldest/screenshots directory in either your home directory (Linux) or your user's Application Data folder (Windows).