As far as I'm aware there is no current way to export the quadrature conversion clock from an encoder task. It would be great to be able to export that signal to use for other things.
For example, you could use this signal to perform an analog acquisition each time your encoder passed a mark, giving you position vs. signal. This would be useful for something like a roughness tester where you drag a stylus across a sample and get roughness vs. position. Or a pressure sensor reading pressure versus crankshaft angle.