I use chamfering on edges that will be catching lighting if we are talking corners where walls meet then no I would not and the as to exporting from Blender I would use either the OBJ format and or FBX and when importing into Poser use the scale of figure like image below and the percentage I usually go with 40% but you may need to adjust this after importing to your scene. Poser 13 has gotten better with importing but Poser native scale is a bit different than other 3D software so tweaking is something you will always have to do. Also before exporting from Blender no matter which format you use always apply scale and rotation this will save you allot of grief in the long run 

Lobo3433

Blender Maya & 3D Forum Moderator 

Renderosity Store

My Free Stuff

Facebook

Twitter

Renderosity Blender 3D Facebook Page