I'm using Wildfire and there is a geometric representation in the mechanism dynamics option. I was also able to show visually the spring reaction force using a vector representation (an arrow than varies in size as the spring is compressed).
No it will not deform and the infinite possibilities for combinations of ends and sizes etc. is why it is represented by an icon with no mass. It is simply a visualization tool to help understand the mathematics behind it. You can set the stiffness K and the length of the spring and in the EOM's thats all that matters. Technically you dont even need the icon but it makes it clearer to the user when you can see a spring in the places you expect them. If you want pictures create a varible spring driven by parameters and set up some relations to calculate the distance between the 2 ends in the assembly and regenerate the model after each move. the spring will update and look right but it has no use in MDO.