We already have RSST/RSSS for that; it doesn't make sense for PSTE to just turn into any element matching it's ctype; it's only meant to turn into rock-based elements, life BRCK or CNCT. And before you bring up the fact that LAVA and ICE/SNOW freeze and melt into any element to which you set the ctype, nobody freezes or melts them into anything other than the elements into which they naturally freeze or melt, or SING in the case of SNOW(SING).