I received the following via email: 

I do like the idea of using something like that in a Combo Scan -- not so much as a stand-alone thing.  Probably the most frequent complaint I get about the site is that people are overwhelmed with options.  My goal when I started the site was to make something simple for people to use, so I hesitate to add more "stuff".

One thing I've thought about over the years is allowing people to specify which signals (scans) appear on the stock pages & in their watchlists & portfolios.  I think something like this is a good reason to implement that kind of customization.  For example, someone could specify "never show me the MACD signals" and they would be filtered out from many of the pages on the site (I'm not sure if I can get rid of them on all pages... I'll have to see how it goes when I try to implement this filtering.)

But when explicitly looking at the lists of scans or running a Combo Scan all scans would be available to choose from.  I think that may be a good way to add some more scans/signals into the mix.

I could see adding some signals primarily for usage in Combo Scans such as:
 

Any thoughts?  Are there other signals I should consider adding?