I can see it now. "Can you add a condition for people with hotmail addresses, IP addresses in the 89.* range, who have not been active for exactly 45 days, and who have less than 200 posts? I want to tell them about something that only applies to them."
This is an un-needed feature IMO. IPS will never be able to satisfy all of the conditions people will want, and this can already be accomplished very easily with minutes of skinning effort. If someone doesn't know how to write the if statement to check something, all they have to do is ask. If they're adding so many that they are getting confused, then they have gone overboard.