Hi Jules,
I might need some more coffee, as it's still early for me, but I'll give it a go...
1 - We don't do this but we've had it come up a bunch post CS6 by FCP'ers like yourselves. File a feature request here:
https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
2 - right-click in the gap to ripple delete. There is also a keyboard shortcut you can use but requires you to 'select' the gap. File the feature request - I'd like that one too!
3 - Never heard this one before - sounds like a feature request to me.
4 - Not that I'm aware of.
5 - answered above
6 - The button editor in the source/program views of CS6 give you some of that functionality, but you can't drag any 'ole command there.
7 - answered above. Finally got that one in believe it or not! ;-)
8 - answered above. Yes, file the request if this is important to you.
9 - You can lock the indivdual tracks but not lock all audio in a sequence with one click. Look at the track header information and you will see the lock button.
10 - I use the Fast color corrector for level control. Essentially a one-color wheel version of the 3-way with many of the same controls. Use the input level slider for crushing blacks. There is also a Levels command like Photoshop, but many more values and no slider...
11 - we've heard about a copy/paste attributes feature from some FCP people and we're looking into it. However, you can select an effect and simply copy and paste it to another clip. You can also select multiple clips on the timeline and choose Edit>Paste Insert and paste that effect to multiple clips. As mentioned above, you can also save a preset and apply that too.
12 - Our audio handling in CS6 is pretty nifty. If you want the Zoom audio to present itself as dual mono, you can set it up in the sequence as such or do it after the fact. Easiest way to discover the possibilities is to select the audio clip, right click and choose Modify>Audio channels. From there you can express a stereo clip as dual mono, a mono clip as stereo, etc.etc...
Hope this helps,
Dennis - Adobe