WebVTT pause-on-exit flag

Quick introduction (hope this doesn't seem like an ad): I'm the owner of Some Techie, LLC. We're working on a JavaScript media player library to play audio/video in web browsers using HTML5, Flash, etc. (sometechie.com/mediaplayer). We're currently working on implementing cross-browser captioning support, based off of Captionator.


While working on supporting the TextTrackCue pause-on-exit property, I noticed that the current WebVTT Draft Report at http://dev.w3.org/html5/webvtt/#dfn-webvtt-cue-settings doesn't support setting the pause-on-exit flag in the WebVTT file. Are there any reasons for not supporting this?

To support this, I propose that we add the something similar to the following text to sub step 2-4 of Parse the WebVTT settings:

If name is a case-sensitive match for "pause-on-exit"
If value is a case-sensitive match for the string "true", then let cue's text track cue line pause-on-exit flag be true.
Otherwise, jump to the step labeled next setting.

We would also need add something similar to the following text to the WebVTT cue settings section, consistent with the way boolean HTML attributes are interpreted:
A WebVTT pause-on-exit cue setting consists of the following components, in the order given:

The string "pause-on-exit".
A U+003A COLON character (:).
The string "true".
NOTE

A WebVTT pause-on-exit cue setting configures whether playback of the media resource is to pause when the cue stops being relevant.

Is there any reason that something like this is not currently in the draft report?

Thanks for all of your work on the WebVTT Draft Report. It's been very helpful.

--
Joshua Dwire
Chief Technologist
Some Techie, LLC
joshua@sometechie.com