Wow, I don't see a way to delete the templates, not sure how you did that.
Click the plus button next to content to add a new content location. Name it "Custom Pages" and check the use as template option.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.