likewise on the S2... it's just held on with velcro. The more you move it forward the more space will be visible on the sides as the footrest is angled to fit further down. Not to many people ever reach the foot rest in my car... it's never been a problem...On the S1 Elise you could move the footrest forward.
You just need to trim your carpet and put some strong velcro on the floor to move your footrest forward.
You need to velcro it to the alloy floor of the car not the carpet.I tried moving it once for my shorter legged gf but didn't find it held too well. I suspect you will run into the same issue if you rely solely on velcro if you are doing some spirited driving. If you don't mind popping a couple of small holes in the carpet I'm sure you can use a couple of more permanent/semi-permanent fasteners to secure it better.
:bow: Better search skills than me.