Adding a GO/RUN physical button to run the MDI command typed in the command line

Hello,
I'm new to Linuxcnc, I've been studying it for a month and I'm very happy with it. 
I'm retrofitting a Cortini mill (a very small industrial-grade italian cnc mill) and thanks to this forum I could get a Ethercat system working with Beckhoff hardware and I could add a lot of external hardware buttons to my system.
For example I can have a program run, pause physical button in auto mode.
I cannot have a physical button for the go/run mdi command line.
Please note: this has nothing to do with custom MDI macro buttons.
To be clear: I put the system in MDI mode, type  "G0X10" then I must use the mouse to have it run.
The keyboard enter button is not the same becouse if i recall a previous mdi command from the list touching it on a touchscreen (or selecting with the mouse) the Enter key doesn't work.
I could not find a halui connection to this go button.
The goal would be to connect it to the start program physical button that is already  working in auto mode but this could be a further step. It would just be great to connect it to a new physical button.
Is this in any way possible?
I hope to have been clear despite my bad english.
Many thanks
Alberto
 

I would like the same functionality.
I would like the setup page in gmoccapy to toggle the execution of MDI commands either by enter key, double click, button (like now) or by HAL signal.
But I did not have time yet.

This functionality cannot be simply implemented using the HAL pin in HALUI, because the EMC_MDIHistory widget is in Gmoccapy. So a new gmoccapy HAL pin should be created.

EMC_MDIHistory widget is here:
github.com/LinuxCNC/linuxcnc/blob/master...cp/hal_mdihistory.py

The function to confirm the command is here:
github.com/LinuxCNC/linuxcnc/blob/bf71ba...history.py#L151-L200

In gmoccapy.py:
github.com/LinuxCNC/linuxcnc/blob/bf71ba...py/gmoccapy.py#L3444

You can create new HAL pin in Gmoccapy for self.widgets.hal_mdihistory.submit()
linuxcnc.org/docs/devel/html/config/python-hal-interface.html