Unfortunately ps2pdf doesn’t allow that. But with a script as simple as that it will convert all ps files in your working directory into pdf and delete the original files:
#!/bin/bash
##
## Written by Leonard Burtscher (burtscher@mpia.de)
## 20 Apr 2010
##
##
## PURPOSE
##
##
## To transform all ps files of a directory into pdf using ps2pdf
## Then delete all ps [...]