I have been working through our company pen settings over the past couple of weeks. I had plenty of feedback from co works about the pen weights. In the process of trying to tweak the different settings, I found through research (AUGI and Discussion Groups) that pens 1 and 2 (model) and pen 1 (drafting) effect majority of the hatching or fill patterns.
Model Pen 1 drives the model hatch pen weight. Model Pen 2 drives the ceiling grid pattern pen weight. All fill regions are assigned to Annotation Pen 1 by default.
To give myself more flexibility in our pens I have decided to move all objects off of pens 1 and 2. Seems a little bold, but I believe it will give us more flexibility in the long run.
