If you do plan to implement something like this (or if someone decides to make a plugin to address this) I'd appreciate it if it wasn't too much work to have the following options:
Tone Hertz
Tone Length
Left/Right Balance
Play two tones at once.
An implementation similar to the Vibrate Pattern action might a nice way to do it, that is something like
Hertz: 200,210,200,210
Length(In MS): 1000,2000,1000,2000
Where the corresponding separated Hertz would match tone length, and silences could be added in by just setting a Hertz section to 0