@panzerman, I tried to register there, but one has to first request a so called "security question" from them via email. I sent them an email for that, but haven't got any answer yet. They say that they don't accept public email addresses like gmail etc., but I haven't used any such public email address. Very funny. If you are registered there, could you kindly help me to get a registration there? Thanks.
Found also a formula for "x times leveraged" option over a normal option: https://www.elitetrader.com/et/threads/x-time-leveraged-option.350091/page-2#post-5204329 With it any leverage factor is possible. It includes also a discount (of up to max. 25% for ATM options with K=S, r=q=0, as an example).
As a "by-product" of my research I've also developed a direct analytic formula for volatility (IV) when CALL or PUT is known together with the other parameters, except of course volatility (IV), for all ATM options. It works for both BSM and FPM Ie. a Closed-form expression (equation, formula), without any iterations. People were saying this is impossible...
Wilmott has wrong DNS records for SPF (TXT), that's the cause why their mails don't get accepted. Mailer log says: