You can toggle any of these items in mod options.

Keycard:
Stacks: 2
Blood Sample:
Stacks: 4
Blood Sample Verified:
Stacks: 2
Gasoline:
Stacks: 2
Liquid Nitrogen:
Stacks: 2
Thermite Paste:
Stacks: 2
Thermite Can:
Stacks: 2
Lance Part:
Stacks: 3
Circle Cutter:
Stacks: 9
Hard Drive:
Stacks: 2
Muriatic Acid:
Stacks: 2
Cuastic Soda:
Stacks: 2
Hydrogen Chloride:
Stacks: 2
Mayan Gold Bar:
Stacks: 16
Printer Ink:
Stacks: 2
Paper Roll:
Stacks: 2
Planks:
Stacks: 2
Boards:
Stacks: 2
C4:
Stacks: 6-9
Crowbar:
Stacks: 4
Saw:
Stacks: 3
Evidence:
Stacks: 3
Blowtorch:
Stacks: 2

Some of the item stacks can be adjusted in mod options.

This mod also include automatic collection of various items when you are close enough to them. This can be toggled in mod options. Some of the collector items only works when host or in stealth.

If you have ideas for equipment to stack or collect, leave a feedback.

Stacker part of the mod is sandboxed and works only if the lobby setting is private/friends only or all players in the lobby got the mod (Message will appear to show if mod is on/off as you interact with something).
To enable it while others are in your lobby, do this:
You can open stacker.lua in notepad and change bypass_identifier = false to bypass_identifier = true, to remove the deactivation. When stacker is deactivated from others joining you, the stack will be transfered to other players or removed.