Ahh, right, we already discussed about this some time (1,5 years ;-) ) ago.
Although I was ok with simple minimalistic instructions at that time, now that we have them (great!), I wouldn't mind to have some extra info also ;-)
Both Locus and OSMAnd have a tag for the streetname (to turn into) in their app-specific gpx extensions. So you could write them to
<extensions><locus:rteStreet> for turninstructionmode 2 (locus-style)
<extensions><street-name> for turninstructionmode 3 (osmand-style)
Additionally, you could consider adding a more detailed description like "turn right into gravel road" into the <desc> tag of the wpt. At least OSMAnd and TrackNavigator seem to use this tag...
Regards,
zossebart