Adding symbols to watch list

Yes but with conditions.

Basically you can scan your list and then merge the scan results back into you original list. Here's an older article which explains this technique in detail.

http://stockcharts.com/articles/scanning/2010/04/in-case-youre-not-familiar-with-the-method-of-using-the-add-many-function-for-creating-a-new-list-or-adding-to-an-existing-li.html

One final note of caution, this system works best with a new list. If you have lists which contain charts with annotations, different time frames and different indicators on each chart, then be careful. It is very easy to overwrite your entire list with these new scan results and replace all the charts with new ones using your default chart style, but you will have the stock names.