I would tie the quilt - I do believe that the t-shirt quilts will lend themselves to that - just make sure you make your ties no more than 4-5 inches apart. It should not distract from the overall appearance of the quilt.

http://www.youtube.com/watch?v=YK20gl3Amvo
http://www.youtube.com/watch?v=kI6AcTqr-YM