I would also use that, gevaerts, though since it is an infrequent switch two .cfg files are currently serving me well. Mainly because my daily-use player is an iPod 5G and it has bass roll-off issues with sub 32 ohm phones.
Line-in:
No EQ
No crossfeed
Volume +6 (for convenience I set the pre-amp to -6 so that the new max for the iPod = 0)
Headphone
A bit of bass boost
Crossfeed
Volume -40