These controls work in nearly every mode available. Exceptions are noted where applicable.

Move camera: Mouse
Quicken/slow time: 7 (slow) and 8 (fast)
Open shop: P
Menu: Esc
Toggle lights: F
Interact:R
Zoom: Scroll wheel
Switch to next vehicle: Tab
Switch the previous vehicle: Shift + Tab
Open finances: Insert
Zoom In: Page Up
Zoom Out: Page Down
Open PDA: I
Expand map: 9

When walking, the following controls may be used:

Walk: WASD
Look: Mouse
Jump: Space
Open hand tool: 1, 2, 3 or scroll wheel
Flashlight: F
Sprint: Shift
Crouch: Ctrl

When driving any self propelled vehicle, the following controls may be used:

Movement and steering: (Forward, Arrow Up), (Back, Arrow Down), (Right, Arrow Right), (Left, Arrow Left)
Cruise Control: ( 3 )
Lower Cruise Control Speed: 1
Raise Cruise Control Speed: 2
Refill (when available): R
Attach/detach implements: Q
Unload tipper: Q
Select implement: g
Change camera view: C
Tool functions: X, V, B, Y, H
Home: Beacon Light
Horn: 0 (Zero)
Signal Lights: keypad 1 (left turn) keypad 2 (hazard light) keypad 3 (right turn) Home (beacon)

In addition to the driving controls, front loaders have some mouse controls available. The actual function of these controls vary based on the implement, but the controls remain the same.

Lift/lower arm: - (F1 - Lift), (F5 - Lower)
Extend/Contract Arm: - (F2 - Extend), (F6 - Contract)
Tilt implement: (F3 - Tilt Up), (F7 - Tilt Down)
Open/close: (F4 - Open), (F8 Close)

For equipment such as the Ponsse Buffalo or Stepa FHL 13 AK, there are a series of mouse controls used to operate the arm. Most players will find that these controls are difficult at first, but easy to quickly master.

Turn arm: Left mouse button + drag horizontally
Lift/lower arm: Left mouse button + drag vertically
Extend arm: Right mouse button + drag horizontally
Lift/lower arm (second joint): Right mouse button + drag vertically
Turn claw: Both mouse buttons + drag horizontally
Open/close claw: Both mouse buttons + drag vertically
Switch camera view (3rd view available in this mode): C

Kudos to this page[farmingsimulator.wikia.com] on the Farming Simulator Wiki.[farmingsimulator.wikia.com]