Hey,
Thanks for your suggestions. Unfortunately 1 – 3 are not possible to achieve in QVox. If you are a desktop user as well, you could use the Quadravox or Octavox plugins to achieve these effects.
As for #4, we can take a look at revising this so that it's possible to overwrite presets. Currently you could tweak the settings, delete the existing user preset, and then re-save, to avoid the renaming issue.
-Tom
