Worth, the NLL doesn't use fieldturf for a fairly simple reason...they already have an official turf supplier, Sportexe.
http://www.sportexe.com/dieterturf_turf.htm
As for using any sort of infill turf system for indoor stadia, it wouldn't work for the simple reason that the turf isn't left in place, but instead is rolled up after each use and stored. Imagine how many little pellets would be on the ice @ the Dome after the turf would be rooled up after a 'Necks game!