The little cardboard E6B I was given when I started flying lessons... would be more of a hassle than clicking on the clipboard. and fighter pilots had an E6B on their "knee board" and used it quite a bit especially in the PTO.
I think if you get used to it you can use it as fast as a calculator, and the batteries never run out! One guy told me a few month ago "I bought mine [E6B] 40 years ago and the batteries still have not ran out". But I do understand that it does take a lot of time to learn to use it fast and for most people it's just not worth it. Depending on what kind of phone you have you can get a free E6B application. If you have a blackberry or an android phone I can help you find one.
Don't get me wrong I'm all for having more options on the ingame E6B, it's just that HTC will take some time to make it and I don't think you want to wait long.
Your right fighter pilots probably did use the E6B in PTO (I did not think of that), but they don't fly alone. One pilot could afford to put his head down to do the calculations while others scan for enemy aircraft.