Can you view proposed trades/pickups?
If there are trades proposed by members in your league to other members can you see the trades prior to them being accepted or rejected?
The reason I ask is because if you do, do you then go out and propose a trade for the same player?
The same with pickups, do you put in for the same player?
That would be highly unethical. To answer your question, I personally do not. I know some software packages don't allow for excluding the Commish from seeing these things, or make it very complicated to do so. I encourage the owners in our league to use Instant Messaging or e-mail for trade negotiations. As to waivers, if you have a concern as an owner, you can do two things: (1) You can check when the Commish enters his waiver requests (they should be date/time stamped). If you see a consistent pattern of last minute bidding, you could have a concern (note, this doesn't mean the Commish is cheating, he might just be consistently entering his picks right before the deadline). Some leagues require the Commish to enter waiver wire bids before a certain time. I think this may unfairly disadvantage the Commish, but it could work.
(2) You can always put in your waiver bids at the last possible moment (i.e. before the waiver deadline closes). This makes it nearly impossible for anyone to cheat on waiver pick-ups, even if they tried.