Yeah it's a shame, on the other chips you can get amazingly air-y textures by setting the LFO to noise and then putting the frequency all the way up. See this video for example: https://youtu.be/_xL3qr-9-ZE
Would sacrificing an operator and setting it to constant mode instead of mult work for this? You'd have to use the feedback operator if you wanted something noisy though.
The operators actually contribute phase, not frequency, and there are very limited ways that they can be routed.
It sounds to me as though a firmware patch should be able to fix that to some extent. The main culprit here is the interrupt service routine, which while tight likely isn't immune to some code golfing.