Skip forward and reverse skip time

Quote from richprim

I would like to change the skip forward and back from 10 seconds to 30 seconds .

In Settings > Player > Videos there's an Actions category where you can define 'Skip steps'.

If you press the skip button 2 times, you'll skip 30 seconds (and 1 min for 3 skips, 3 mins for 4 skips, etc).