Too much transmission fluid will cause the gearbox slip out of the gears, while running. But you need at least a quart over the top to reach that problem.

740's are prone to engine shakes at idle, and the cause is usually bad engine mounts. The hydraulic mounts are a little pricey, but aftermarket is a lot cheaper than the dealer. The rear transmission mount can fail as well, and that one is cheap (<$10).
Also a good throttle body cleaning should smooth the idle some. Gasket is $1.
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Rob Bareiss, New London CT ::: "Roterande Fläkt Och Drivremmar!"

There's no stress on the torque converter or the seals. The trans will ditch what it doesn't want, so you can pretty much assure yourself that it isn't too full. I've seen a lot of AW transmissions where the stick reads way up when the trans is hot, or has been sitting for an hour or two.

(I read it the correct way. Thanx.)

Regardless of what the stick is saying, your shake at idle is a result of some other problem, not the transmission fluid level. Unless it is way too low.
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chris herbst, near chicago