Need efficient way to advance through slide timeline with keyboard or screen reader

I heard from Support that it is possible to advance or rewind by a number of seconds. It's just not obvious how. 

If you create a trigger that has the action "Jump to time/cue point" you can click on the word "time" and choose "forward/backward seconds", then enter a numeric value, where positive number move forward and negative numbers move backward.

So the feature exists. It's just very opaque to end-users. Thanks to Rafael in Support for explaining this to me.

(Who at Articulate decided that the font for the Trigger dialog-like panel thingy should be so tiny? Why can't it at least be easily changed to something readable without a struggle?)