a simple question...
why tell the tsa you have gel shoe inserts?

simply go thru the shoe carnival and see what happens. 5 hockey pucks says nothing will happen but if are concerned....
you can always put an old pair of inserts inside the shoes that "
have to now go on the belt" and leave the good pair of inserts either inside a 2nd pair of shoes in your carry on or simply in the carry on by themselves if you are not caryying a second pair of shoes