Palette Controls: see picture.
If you come up with something please let us know! But one thing I can tell you is that generating scaled data for even two parameters simultaneously in the environment is extremely difficult (if not impossibly difficult). Here's an example:
You have two tones, A and B, where A's cutoff is 64 and B's cutoff is 12. You want to create a "master" cutoff fader that will raise or lower the cutoff for A and B with those values as starting offsets. For A, it's easy enough to feed it a value that's based off the actual position of the master cutoff control. With the master starting at 64, you move it up + 1 and A's cutoff will increase in value to 65 just as you'd want. But what about B?
Well, you could run the output of the master cutoff control through a transformer and use the scale function so that its values of 65 - 127 generate values from 13 - 127. That's easy (though you'll get some stairstepping in B's filter response).
Now you return the master control to 64 and this puts A's cutoff back to 64 and B's cutoff back to 12. But then you want to move the cutoff frequency down on both sounds. Here, the master can send values of 63 ---> 0 directly to A, but you'll need a different transformer to scale 63 --> 0 values between 11 and 0 for B.
Of course, this example is fairly easy to implement because A's value is a very convenient 64 (no scaling necessary) and B's value scaling would only involve two transformers. But let's say A's offset wasn't 64; you'd now need four transformers, two for A and two for B, each set with different scale and offset values to handle values above and below your various starting offset values. Multiply the complication of that by 2 (because you're dealing with four tones) and thus you need to program 8 transformers. Not easy, especially because you can't see the programming content of more than one transformer at a time.
Does your head hurt yet?