My view is similar to sangaman on this. If they wanted to inside trade on a big scale they would likely do it not on their exchange just like insiders often trade through third persons. If bitfinex was actively and automatically trading against its users by front running, stop huntingen etc. they wouldn't tell us anyway.
It's best to keep a close eye on trading/the order book just like people are doing now and mentioning any possible manipulations like the volume manipulation that is rampant on zero fee exchanges. If something like that on BFX happens be sure to notify people.
Mjr has mentioned countless of times in the past that he is prodiving swaps on BFX which initially made me wonder as well but I guess it's to be expected in an unregulated market like this.

What I'd like to see from BFX in the near future is the following:

1. An official statement on their policy regarding inside trading and a promise that their employees/founders are not actively trading against BFX regular users.

2. An official statement regarding the potential losses incurred through the Egopay incident and how they will be shouldered.

3. An explanation about "tether". It seems clear that tether has a direct affiliation with Bitfinex and I want to make sure BFX stays safe when they enter the international money transmitter business. Some former companies like liberty reserve got burned very badly for their operation. Why is tether already integrated into Bitfinex if it is not even usable at the moment?