Some multi-tools, especially Leathermans, can be customized. If you want different or specialized tools on your multi-tool, you may be able to switch them out with tools from other multi-tools or make completely customized tools.
Several tool mods
Leather Awl
Gouges and chisel
Picture: history.com
Lacks an awl
You can trade a tool for a Rebar awl
Replace Wave (preWave+ had smaller pliers) pliers with Rebar pliers
Replace Wave scissors with Rebar awl
Replace Wave file with Wingman scissors
Replace Wave PE blade with Charge S30V blade
Lacks a full size/time Saw
It does have a T-shank Saw but shares this position with the file
Serrated blade can also be replaced with a second T-shank holder - allowing for saw AND file on tool at same time, or even 2 different types of saws
Thumb tabs for main blades
Comes with a combo-serrated blade
Replace with Wave or Charge s30V blade. This mod will need some bushings since the Charge blade is thinner and to offset blade from awl.
Clay Hayes' P4
Can opener sharpened for gouging
Brooke Whipple's Modified Supertool 300
Spoon Carving Tool
Felix Immler's Löffelschnitz-Werkzeug