Clara HD Front light turnoff delay

[ztgasdf]

Hello!

I recently bought a Clara HD for myself, and I'm wondering if there is any way to make the frontlight turn off faster when putting the device to sleep.

On Nickel (think that's what it's called): About three seconds after sleep, two seconds after wakeup
On Plato: Around three seconds after sleep, instant after wakeup
On KOReader: Instantaneous(!) on both sleep and wakeup

I prefer to use the stock reader, as KOReader is abysmally slow when it comes to changing the font settings (it can take 20+ seconds on very large ebooks, compared to about three and a half), and I've somehow screwed up the zoom with Plato. (I tried pinch zooming and now the text is stuck on the top left corner, with a font size for ants.)