As a general rule, anything that simplifies and better automates all the various WW clothing options is the way to go.

1. Automated conversion of nonstandard named items such as helmets, paldrons, coattails (as TrekkiGrrl mentioned), etc. that are part of clothing items, but are not converted by WW. There are workarounds to keep them, but doing those conversions automatically would be better.

2. Automatically convert to scaled figures. There are workarounds to this, but I couldn't get them to work correctly.  Fix this and the process of converting to smaller (children) characters can improve.

3. Do a better job of retaining loose fitted clothing.  WW tends to tightly fit conversions such that a robe becomes form-fitting

4. Handle non-zeroed clothing better. If a clothing item wasn't designed around a zeroed figure, it won't convert correctly without first movnig the clothing item, to fit a zeroed figure, and exporting as a new Obj to give WW a better zeroed starting point. If a clothing item conforms correctly, without poke-through, it would be nice to have WW work from that.

5. A process for the community to create new figure conversions for WW. You're one man and there's only so much that you can do with all the projects you have. If there were a way for the community to develop new figures, nearly every figure would have WW support.

6. A more comprehensive FAQ to incorporate all the little tweaks and nuances to handle the various things that improve a conversion.

I haven't tried to figure out which would be easy or practical. Some, such as making the conversion process more open, probably cannot be done because of trade secrets. I figured it's better to throw everything on the table and let you figure out which are easy to incorporate.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon