A number of improvements that would help us support remote conferences:
1. Force use of the web client. Our most troublesome participants are ones that already have a lync client installed. (os-x office 2011) Forcing the use of the web client ensures we know what software they are connecting using and we know everyone is experiencing the conference the same way.
2. Force/create static layouts. Allow a default, non-changable layout to be pushed to participants similar to Adobe Connect's pod layouts. This ensures participants all see and can easily refer to the same items.
3. Hide/minimize select participants. We often have 'lurker' accounts that sign in to a meeting for monitoring, QA or to offer technical support. It would be nice to minimize or otherwise demote their attendance in a meeting so their presence doesn't waste screen real estate.