That would probably also involve adding Spellcraft to the class skill list, now that I look at it.
Also, the Dreamsight ability, the one all the others are based on, required an opposed Scry check. Opposed Spellcraft doesn't feel right. To line up with other similar abilities (bardsong, stunning fist) I think the target should get a Will save to resist of DC 10 + (1/2 Dreamwalker's caster level) + (Dreamwalker's key ability modifier). Also, since the Dreamwalker might be any of the major spellcasting classes, the ability that modifies the save DCs for the rest of the abilities should be whatever the caster's prime ability already is.
(Granted, this may cause confusion in someone playing a mystic theurge/dreamwalker. In my opinion, that combo should be dissuaded anyway.)