I have used silicone in the house, but some swear by it, others swear at it. Silicone is not at its best in the situation you describe. It does not have the highest adhesive properties and I have seen it separate from the surface in a somewhat similar application on a sectional shower in my son's home. The problem is the kind of weight shifting that occurs on the pan while showering will simply break a silicone seal and you might not even notice.
Definitely use a bathroom/tub/tile type of caulk as it has the mold inhibitors needed in this wet and humid area. Otherwise caulk, and paint, especially the latex variety, is a great nutrient source for mold.
Check this link for a suggested product and some techniques: