Now that there are long and short ETFs in the major indexes, is it legitimate to use opposites to adjust your deltas? For example let's say you have some combination of options in SSO (Proshares 2X long S&P500) that has a total position delta of +100. Would it work to buy 100 shares of SDS (2X short S&P500) to try to get delta neutral? I'm thinking it would be approximately the equivalent of shorting 100 shares of SSO. I'm thinking of situations where the obvious choice would be to sell some of the underlying which might result in naked short calls, but your broker won't let you do it.