Yes, we have commands for this, but they are not part of the standard configuration for MM and they are also as yet undocumented in the help.
The two commands are:
MM.LoadEqPreset, and MM.SetEQ
turn EQ on like this
MM.SetEQ true
and off like this
MM.SetEQ false
and load a preset using the filename like this (no path required other than the filename, but you need the .sde at the end)
MM.LoadEqPreset Rock.sde
the filename is not case sensitive. Loading any preset will automatically turn EQ on.
Here's an xml file with some basic presets. Drag it into your command tree to import it.