Enhancement needed: Ability to filter by a Stock Market Index such as SP500

Please provide a search/filter criteria in the Stock Screener to limit the search to those tickers found in:

1) A specific stock market index such as SP500, SP400 or SP600 or CAC40 etc.

2) To tickers within a specified watchlist 

The above filter criteria is to augment the many criteria you already have such as country/Sector/Industry etc. Finviz.com has Index as one of the searchable criteria but frustratingly they limit it to just DJIA and SP500.