Universal has an Attraction Assistance Pass (AAP) that allows for return times for disabled guests for lines with a 30+ minute wait time, similar to Disney's DAS. You can only hold one return time at a time. If there's a virtual queue already available for the attraction, you're expected to use that instead. Details here:
Visiting Universal Orlando with a person with mental, physical, or learning disabilities can be an anxious time. Let us help by explaining the procedures.
orlandoinformer.com
BETTER YET -- if you stay at a premier onsite hotel (Hard Rock, Royal Pacific or Portofino Bay) the entire family will be entitled to Unlimited Express Pass benefits, meaning you'd all able to use an expedited line at every attraction, every time. I highly recommend looking into it - especially if you were already considering an onsite stay - so you don't even have to mess with an AAP or juggle return times. Express pass is also available as a ticket add-on (~$100/per person, per day), but staying at a hotel that offers it is almost always less expensive, as the benefit extends to everyone in the room throughout your stay, including arrival and departure days. If you opt to purchase an annual pass (seasonal annual passes at Universal cost about the same as a 2-day park-to-park ticket, subject to blackout dates around Christmas/New Year's, Easter, and the month of July), you can save 30% off the rack rate of many rooms at those premier hotels.