Not sure if it is available...but it would be really helpfull to have a gcode for babystepping. Recent dev branch of Slic3r supports custom-gcode for filaments. That sounds really great because PLA & ABS needs different "leveling" between (heated) bet and nozzle.
Unfortunately Repetier does not support M290... :(
Is there any plan to include it in later versions?
Regards,
DeJe