Good news. I think this is fixed.
I just installed the new Sonar, and I'm trying a few things out. Here's the procedure I tried in X3 and then in Sonar Platinum:
1. Open Zebra, Diva, or Bazille.
2. Open the patch browser.
3. Click the Give all Keystrokes to Plug-in icon.
4. Select a patch and click Save.
5. In the Enter Presetname box, type some letters and numbers.
In X3 the results depend on what you type. In other words, Sonar still owns most keystrokes.
In Platinum the text you type appears in the box as you type it. No surprises.
Thank you, Cakewalk!