Answer: yes. The slave part of the code looks like the following:

     valueOpDeltaAdd
    
   
   
    deltaAddDelta

Multiple slaving blocks can be added to a single parameter. Here's an example:

     valueOpDeltaAdd
     Figure 1
     rCollar:1
    zRot
    deltaAddDelta 0.01
   
    valueOpDeltaAdd
     Figure 1
    BODY:1
   JCMShoulderUpDown
   deltaAddDelta 1.000

The nice part is that you can have all kinds of master dials. Rotation/translation/scale channels can be used, valueParms can be used, targetGeoms can be used.
The same goes for slave dials: anything that is a channel can be slaved to another channel.
And the master channel doesn't have to be in the same figure as the slave channel; this is how "superconforming" works.
Superconforming means that a conformed clothing item automatically assumes the same morph dial values as the conforming target, which means that morph tweaking on the clothing is greatly reduced.
In the case of the base figure itself, you'll want to have the master channel in the same figure as the slave channel. This is how full body morphs work.

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