Reading Hal pin value in G-Code

Hello.
Recently i've encountered issue about reading hal pin value from gcode. Then, i followed steps that has been shared in this forum and i've been able to read hal pin values in my G-code except one little problem by setting FEATURES=12 in my ini file.

As you know, interpreter reads hal pins when it gets started. After that, it reads always same value. The problem is, i am trying make a process automatic, and the best way to implement this automatization is using g-code. When machine moves, the pin that i am reading is changing (i am measuring something inside this hal component). It might be other couple of ways to do it, but i want to do it with g-code, so i need to read hal pin value in that time. 

Is there any way to make this in g-code? I have knowledge about preset global variables in g-code. And they are actually implementing this at the core. The reason that i am saying this is, the X,Y,Z coordinates for example, they are actually stored in a hal component and with preset global variables, we are actually accessing whatever their value is in that time.

Here is my ideas:
* Recompiling RS74 interpreter, adding new preset variables, replacing with old one (difficulty: hard)
* Making this automatization with python. It gives me ability to read Machine variables, measurement data at the same time.

The reason that i don't want to do it with python is i want to make everyone understand about it. And writing G-code is usually easier than writing python code. (this is my idea.) The process is gonna be like one hal component and the g-code that logs measurement and machine coordinates stuff. It's like plug and play.

And i am also more curious about recompiling RS274 interpreter, if you have experience about it, i would be greatful. Actually i have experience about compiling machinekit and linuxcnc softwares and making contact with programmers in this context would be very good. 

Thank you for your time, if you share your knowledge with me, i appreciate that.

Berkay.
 

This is my 'linuxcnc_var all' command output.
LINUXCNCVERSION=0.1
REALTIME=/bin/realtime
SIMULATOR=@SIMULATOR@