Greg,
You don’t need the RTAS open to use keyframes.
In the Timeline fast menu [bottom left of the timeline widow] select Audio Data and check the Glip Gain option.
With the Keyframe mode activated on the Timeline you can add a keyframe to any selected audio track by placing the position bar and using the keyframe button/ mapped keyboard command [it’s the pink triangle in the FX tab of the Command Pallette]
Personally I find this much faster than adding Keyframes in FCP as you don’t need to keep swapping tools.
To adjust the keyframe up or down simply move your pointer over it [it will change to the ‘hand’ symbol] and drag up or down.
To adjust left or right hold down the alt key whilst dragging.
To adjust more than one Keyframe at a time mark and in and out on the Timeline and all keyframes in between will move together (up and down, but sadly not side to side)
If you don’t want to see the clip gain info all the time save alternate Timeline views in the View Menu at the bottom of the Timeline.
You might also want to make the audio tracks larger to get more control over your keyframes – with your audio tracks selected press the Apple Key and ‘L’ to make the tracks larger (‘K’ to make them smaller). These views can also be be saved as custom Timeline views for quickly switching between cutting and key framing tasks.
Myles