What types of ski carriage does this allow,...
What types of ski carriage does this allow, both diagonal and A frame?
Is this pack compatible with a harness and general rope work for lines with tricky entrances?
Diagonal ski carry. You can strap skis on there a-frame style but it will get in the way of the airbag's deploy, so not recommended. In terms of harness compatibility - yes, you can fit a harness under there. The leg loop is not the most comfy in the world but it definitely can be fit alongside a harness.