This is a comprehensive list of all the Gatherer command line commands that are available from within the game. In order to access these commands, just start typing them into the game. The message box should appear as you type the first "/".
Help on these commands is also available in the game by typing /gatherer help
Gatherer commands:
/gather (on|off|toggle) turns the gather minimap display on and off
/gather mainmap (on|off|toggle) turns the gather mainmap display on and off
/gather minder (on|off|toggle|<n>) turns the gather map minder on and off (remembers and reopens your last open main map; within 5s)
/gather dist <n> sets the maximum search distance for display (0=infinite(default), typical=10)
/gather num <n> sets the maximum number of items to display (default=10, up to 25)
/gather fdist <n> sets a fade distance (in units) for the icons to fade out by (default = 20)
/gather fperc <n> sets the percentage for fade at max fade distance (default = 80 [=80% faded])
/gather theme <name> sets the icon theme: original, shaded (default), or iconic
/gather idist <n> sets the minimap distance at which the gather icon will become iconic (0 = off, 1-60 = pixel radius on minimap, default = 40)
/gather herbs (on|off|toggle|auto) select whether to show herb data on the minimap
/gather mining (on|off|toggle|auto) select whether to show mining data on the minimap
/gather treasure (on|off|toggle|auto) select whether to show treasure data on the minimap