Doo does that this year with the 4s Ace 900 lower limit I think is 45mph then can move back to full HP just hit a button for HP mode you want. Perfect for your purpose little interest for me. Lots of people were checking out Ace 900 GSX at Wausau show & I couldn't get near the sled. I think it was a big seller for them this year.
Only negative about the Ski Doo 900 ACE for new or younger riders is the cost of the sled, not an entry-level price for that market unfortunately.
I think many people will be surprised by the 900ACE, I was. Will be fun to finally get the sled, and get out on the snow!
As far as new tech for sleds, if cost wasn't such a concern, I think we would see more use of lighter weight materials to cut down on weight.
One thing that would be good to see, is if they could design the bearings for use in the driveline and rear suspension to be truly sealed and not need any servicing due to moisture getting inside of them.