I had a Summoner/Ranger hybrid in one playthrough (Lhose). The crossbow does not fit in this build for me. Because of the totems which can under some circumstances be advantageous (long fights, much place to position, Radeka for example).
First turn make incarnate and melee buff. Second turn make totem and shoot. Or make totem, range buff and a 1-ap skill, heal, Encourage, Tactical Retreat or so. Then totem and shoot, and so on.
Or, better, skip the Summoner part and take a really effective skillset instead.
