Thumnbnail creation (other seconds)
So is good for settings:
Show thumnbnail "on/off button""arrow"
Why arrow? The user know here are extra options.
When the user tap on this option area, come extra window (see WiFi Transfer).
Then see the user e.g
Thumnbnail creation "here come precise slider(http://forum.nplayer.tv/topic/88/precise-slider)(solution 2 is good with so button" the user can change from 0-600 seconds.