EMC and metric units

[Paul Corner <paul.corner-at-tesco.net>]

Hi All

 Just hacking tkemc to switch the display between metric and imperial
measurements - the XYZ readouts were easy, but.....
On the machines I have used, switching between G20,G21 (G70,71 over here)
would automatically apply to tool and work offsets. To use the same units
across the board (except for the INI parameters) would encourage metric users
to take up EMC.
How easy would it be to also include G70,G71 alongside G20,G21 ?

 One last question - Why does an active G41,G42 mode trigger an error when a
G00 move is encountered ?

 Regards, Paul.