Marlin firmware: add custom button, is possible?

Hi all, i'm new to this forum and to 3D world too!

My team have a prusa i3 with arduino mega and ranps 1.4 all directed by marlin 3.

my noob question is: it's possible to easly modify firmware to get one unused pin on arduino (if there is) and program the firmware to do this when it is up?
-pause printing
-save position
-go the extruder to a custom xyz position
And when pin is down
-goto back to previous position
-continue printing

Is there a easier way than others?using g or m codes?
Many many thanx for any answer, sorry i'm a complitely noob in this thing!

would the position you want the hot end to move to be different each time?

would the position be relative to where the hot end was at power up or the absolute axis system?

Hi barkerboy!
Thankyou for answer!

no the position (absolute) to move is always the same. And then back to the point when paused.

Have you got some ideas or thread to read? It's possible to do it, adding the control on a unused pin?

Many many thanx!

In pronterface, I'd experiment with a macro with '';@pause' and ';@resume' per [github.com]