It would be nice to have some (all?) of the details and weapon parts added into the Outfit creator and have that editor be able to alter detail/weapons and change the size of such. Some of the detail parts and weapon parts can be used rather nicely as part of an outfit... but it's terribly hard to do this right now as you have to get past 2 stages to check your work (or jump between editors and different creatures).

On a related note, it would be nice if there were at least some minor ability to change your creature past Creature stage such as tweaking detail parts only. Again, sometimes they can be used nicely in outfits or tweaking them later because it didn't end up quite how you wanted.

Alternately: Make tons more outfitter parts.