Change acceleration on the fly?

using the python interface for on the fly feedrate changes is a bad idea that is what the real time 'motion' pins are for:
linuxcnc.org/docs/html/man/man9/motion.9.html

Hello Rodw,

I tried offset concept with the current system, but at the end fallback to the same thing happening previously. 

I have added the hal files and opratated the system, when start eoffset and changing the accelaration the accelaration changes only on Z axis level offset movement only, but this did not affect the possible speed variation on the other axis, can be increase or decreased.

also modified (attached) the eoffset hal file and xml file to set the acceleration dynamically but the reasult the small files get buffered in the queue by emctaskplan calls and the velocity/accel change commands never get executed, also shared the log file..
 

Thank you Aciera for sharing tips, will definitely convert it to motion pins.

I have gone thrugh the motion section pins in  linuxcnc.org/docs/html/man/man9/motion.9.html , but i am unable to find the feed override inputs. can you please share more details on this...