Load Filament firmware file

Hi,

I am currently working on my version of a direct drive extruder. I was using before a wade Extruder.
As firmware I am using Marlin. I am looking now for a file or option to enable a "load Filament". It is a bit annoying to always have to use the "Move Axis" option in "Prepare".
Is the file or a setting I can change to enable such a option?

Thanks in advance for you help

Max

What printer are you using? What software?

I am using an i3 Prusa printer and have the marlin software uploaded as firmware.
I want to add some code to the marlin firmware, so that I have a an option to extrude a certain length of filament automatically.
For instance the tantillus software offers it. But I want the Code, so that I don't need to reprogram everything.

[www.tantillus.org]