Slowing it down is simple. Add more bogus frequencies in between the valid ones.
000 159.16500
001 1300.0000
002 154.84500
003 1300.0000
004 154.32500
005 1300.0000
I suppose you could even duplicate the frequency a couple of times to simulate more hang-time on each channel.
You can't speed it up at all other than removing frequencies/banks. Doesn't really speed it up, but it will roll back around to the desired frequencies more often...... It just wasn't one of those features that most people wanted (HYPER-SCAN from the older models)
On a trunked system, just program in your control channel. Be sure the scanner delay is off and set the Talkgroup delay to 500 ms since most systems have a built in hang-time already. (MAN, PROG, TRUNK, FUNC, DELAY and then scroll thru available values) WIN96 allows you to enter a specific value in milliseconds, but I don't know if the scanner defaults it to one of the preset values or not (ie 250ms defaults to 500ms). But then you may miss some replies....