It looks like you're new here. If you want to get involved, click one of these buttons!
Insert to enable the camera (only have to do this once)
Home to enable custom FOV
End to toggle freecam on and off
Numpad 2/8 = move camera forward\backward
Numpad 4/6 = move camera side to side (strafe)
Numpad 3/9 = move camera up and down
(Hold ALT for faster movement, CTRL for slower movement)
Numpad + and - to increase\decrease FOV
F5 to lock mouse movement (see high-res screenshots section for more details)
F3 to enable
F3 again to pause
F4 to resume
Hitman supports dynamic resolution switching in windowed mode (aka, "Hotsampling"). This allows you to easily switch to different aspect ratios and resolutions on the fly.
Switching resolutions with SRWE can be tricky in Hitman as you need to alt-tab back into the game for the new resolution to kick in. However, mouse movement outside of the game is still being recorded inside the game. As a result, you must lock the mouse movement with F5 while the freecam is enabled before alt-tabbing to change resolutions. Otherwise you will lose your camera angle when you alt-tab back in.
I've zipped up my SRWE profiles (organized in folders from narrow to wide) if anyone wants them.