Attached Link: http://forum.daz3d.com/viewtopic.php?t=9060&highlight=runtime

That link will help you set up external runtimes (runtimes that are outside the main Poser folder)

You should be able to delete Ben and Kate stuff without harming the other poser files. Just make sure you are deleting only files related to them and not something else by accident. 

If you find that you have more installed content than you want, why not just uninstall Poser and reinstall it using one of the options presented at the beginning? It's possible to pick a few type of installs. I usually opt for the minimum install which saves me over a gig of space on my hard drive. I find it far easier than installing the whole thing and then having to go and pick through folders trying to delete content I don't want.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi