Hmmm, not sure I understand how 3x speed for 2 seconds would add up to 30 seconds. I've seen a slip function on my dvd player and I definately don't like it.
I've got a programable remote, and I have 3 keys for 4,5,6 30sec skips. If I'm watching football, for ex, usually a 2 minute skip is perfect. I can program the delay between key sends and I'm sending them at about 3-4 per second. This gives me a complete comercial jump in 1 second with 1 keypress. Also works for basketball. Not useful for regular shows, where you do have to use the replay to get back when you skip too much.
Often I watch football using the 30sec skip, to skip to the next play. Works really well. Guy gets tackled, click, the next play is just about to start.
Clearly the reason for the slip is not technical, they are afraid of advertisers. The skip lets me completely bypass offensive material and at my age I don't need to get a jolt of testosterone to try to sell me a beer, which I don't drink.