Love the service, but I would like more options when choosing from the niche drop down menu. I'm doing
home security and choosing  the Home and Garden niche seems way too broad. You should have a primary
category with broad categories and then a secondary category with more specific niches. This needs WAY more
options. Any possibility of improving this?

We are working on new features.
You can track new features in Announcements section. I'll release a newsletter for existing members with all new feature details.

Regarding Niche categories, I will analyze and add more categories soon. You can suggest few here which you have came across.