Yes they will want to lay eggs. They are like chickens, they dont necessarily have to lay fertile eggs. They have the need to lay the eggs, and it is very important that you let them lay the eggs because if they dont they may become eggbound and have serious complications. My turtles always show signs of wanting out of the tank, thats when I know I need to give them some dirt to dig in. I have a horse feeder that has two sides to it. When its laying time I just put one half dirt and the other half water. I don't keep the RES eggs, because of the over population of them, but it also works well for my painteds and musk turtle... My husbandry skills werent good enough this year to actually hatch any eggs but I will keep trying. I hope this helped.
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Slow and Steady wins the race...