On the StkHacker tab, left click search in, and select, Category-->All Optionable and you will then be beginning your search with the universe of all Optionable stocks.
Really, if you think you should be able to achieve something within the platform it probably is there and you need to probe a bit or ask for help in how to access it. If it isn't there, you can still ask for it, but first consider is the lack of that feature really the thing that stands between you and trading success or is it something more basic than that.
I am at a point where my knowledge of the platform exceeds my ability and practice as a trader. Mistakes I make on position sizing and risk control and entry and exit are not at all due to the platform. I almost wish they would stop improving it so as not provide excuse to distracting me from being disciplined in the basics.
I know you asked about the platform, but I consider the big advantage of TOS is that you can easily get 1.5 per contract with no ticket charge. This enables you to trade small when starting out without being penalized for small trade size.
Thinkorswim is one of a very few companies where I am glad just to be their customer and the only broker I feel that way about.
Good luck in deciding. You can always move your account. I think TOS has the advantage for the active trader. Check out the Wednesday afternoon chats archived at http://www.thinkorswim.com/tos/displayPage.tos?webpage=onlineSeminar
You don't even need to be a customer to learn something from them, but it helps.