While SWAT 4's default key bindings are a massive improvement over SWAT 3's, there are still many essential actions that have awkward and hard-to-reach defaults (crouch: c, flashlight: v, handcuffs: h..) Here is my attempt to streamline them.

Movement
Move Forward: W
Move Backward: S
Sidestep Left: A
Sidestep Right: D
Lean Left: Q
Lean Right: E
Run/Walk: Shift
Crouch: Ctrl
Toggle Run/Walk: ----
Toggle Crouch: ----

Interaction
Fire: Left Mouse
Reload: R
Equip Handcuffs: Mouse Back
Change Firing Mode: Mouse Forward
Zoom: Z
Toggle Flashlight: F
Use: Middle Mouse
Display Objectives & Scores: B, M, O
Equip Next Weapon: Mouse Wheel Down
Equip Previous Weapon: Mouse Wheel Up

Command
Change Command Group: Tab
Toggle Red Team Viewports: Insert, NumPad 1
Toggle Blue Team Viewports: Home, NumPad 2
Toggle Sniper Viewports: Page Up, NumPad 3
Deactivate Viewports: End, Numpad 0
Control Viewports: Caps Lock
Open Graphic Command Interface: Right Mouse
Give Quick Command: Space
Scroll Command Up: ----
Scroll Command Down: ----
Say: T
Team Say: Y
Scroll Chat Up: Up Arrow
Scroll Chat Down: Down Arrow
Scroll Chat Page Up: ----
Scroll Chat Page Down: ----
Scroll Chat To Home: ----
Scroll Chat To End: ----

What are your key bindings?

Okay, as a person with hand problems... how are C, V and H hard to reach?

C makes it impossible to strafe right while crouching. H requires me to take my hand off WASD entirely. V could be hit with just my thumb, but it's slightly off center from the space bar, requiring me to look down at the keyboard to toggle it.

You must have small hands. ;)

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I'd share in full but print screen doesn't work in this game for me and I haven't bothered to hook it up to Steam for its own screenshot key, if that would even work better at all (a fully black screen is all I get to paste in after using print screen).

I can remember that I have the flashlight on the middle mouse button, crouch (toggle) on Ctrl and handcuffs on Z. C is set to switch fire modes (so no real need to do it during strafing), the two extra thumb mouse buttons have melee and quick command (instead of space which is easy to press by accident at times), right click is zoom as in modern FPS. I'm not too deep in the game but I believe I've only left the defaults and other hard to reach keys for things I don't think are of real use like the throw lightstick command (L).

I use the classic SWAT 3 style always active squad commands.

This game could have used a radial menu for the equipment. SWAT3 also (which actually has a radial display but it isn't there to let you quick select stuff, it's just to remind you of what you have on you, what's equipped and which F key selects what, sad). Maybe if anyone revives the series or does a spiritual successor they will make something more intuitive for this. Fat chance of a successor of course...