Then a 10" rough toilet would give you more room for that purpose.
I would recommend visiting the manufacturer websites and looking at the specifications for any toilet you are considering as it will show the distance between the tank and the wall and the correct rough in.
If you buy a toilet with a 10" rough and it would have 1 1/4" between the tank and the wall then install it on an 11" rough you will end up with a 2 1/4" space. At some point it starts looking like it is out in the middle of the room. Then too you may end up with one of those folks that likes to relax and lean back against the tank which stresses the tank to bowl connection when the wall isn't close.
I highly recommend checking your choices for flush performance at this website. http://www.map-testing.com/about/max...ap-search.html
10" rough and ADA severely reduces the number of models available...
I'm partial to Toto Toilets I'll admit it... They have 3 models you might consider...
All of them have a 3/4" space which with your rough will give you a 1 3/4" space.