For those of you considering transferring to 4-hour EASY soon...
My son did it himself. He flatly refused to feed after 3 1/2 hours one day. After a terrible two days of battling to get him to feed and sleep when I thought he should (he was only 3 months and 3 days old at the time!) I gave in and went to 4-hour EASY. He still struggles to stay awake for 2 hours - it's usually more like 1 hour 45 mins - but magically, as soon as we went to 4-hour, the 45 minute naps stopped. Well, not stopped, exactly, he still does one every couple of days, but mostly he goes down to bed and sleeps until either I go to get him, or he wakes up about 5 minutes before his feed is due.
Watch YOUR baby. If you find he/she is not particularly eager to feed after 3 1/2 hours, start the transition. Your baby will do it when he/she is ready.
And incidentally, about props when doing 45 minutes nap - my trick was never, ever to pick Kieran up. I just went in, keepign the room dark, wrapped him back up if he'd escaped the swaddle, and popped his dummy in. 9 times out of 10 he'd fall back to sleep within 10 minutes and then sleep until I went to get him.
I guess the question is, do you want your baby to have good naps now? If so, weaning them off a dummy a bit later is probably not that big a deal. Incidentally Kieran doesn't use the dummy a lot - it's strictly for bed, and often when initially ging down for a nap he doesn't need it.