not really, feel free just don't hold it there.
Personally i'd probably stick to varying between 40-80% of throttle and avoiding WOT except just for a blip. (Wide Open Throttle)
We just did 2 60 mile runs with another member here breaking in his 215 GTR, and I know we pushed him to some short WOT runs just to keep it up, and didn't have any concerns, but we also backed down pretty quickly as soon as he fell back in the pack so he wouldn't be tempted to keep pegging the throttle to keep us in sight.
anyhoo...
practicing maneuvers is probably the best advice I can give during the break in if your new to pwc's or new to your machine, wide sweeping S turns at various speeds, getting used to how the PWC turns at various speeds and throttle, brapping the throttle through turns to increase your comfort level so that your hand/brain work on instinct and you can keep your craft under 100% control.
find some crab traps or similar and run through them like in a slalom course, make u turns around obstacles, always keep the obstacle on the opposite side of your turn so just in case your steering cable snaps you won't be slamming into something... < ya it happens
Learn to keep all other craft in sight at all times, no silly maneuvers when you have somebody behind you, train the guy behind you to always be a solid distance behind AND to the side and aware of YOU at all times, in the same respect its important for YOU to be aware of THEM at all times to avoid the potential for a big ugly crash.
When i'm in a pack of ski's i'm constantly looking over my shoulder or glancing in the mirror, checking on the other riders and making sure we all keep a safe distance. We have hand signals that everybody knows and dam well better pay attention to.
Inexperience can be dangerous, you sneak up beside another ski, he's not paying attention then decides to make a hard left right into you, BLAM! I've seen the results of innocent horseplay, its not pretty.
my buddy reminded me saturday that his 2nd ski (RXP) is a dead man's ski, the previous owner was goofing off riding along the shoreline, looked over his shoulder too long,looked up and saw a dock 20 feet in front, made a hard left, the ski made the turn w/o a scratch but he got tossed head first into the dock, died.
3 months ago I bought a trunk full of spare RXT parts, the owner told me his ski was totaled, his wife lost her leg, 7 surgeries, disabled for life, because they were pulling out of a no wake zone he hit the throttle to about 15 mph then slowed down to check on his best friend, who had pegged the throttle while looking back over his shoulder and hit his ski at about 55mph... the wife is lucky she didn't die, but it was a simple mistake with drastic consequences.
The example above is why when we pull out of a no wake zone we're staggered almost in a V pattern, so that even if the leader stops, you won't run his ass over.