Actually I feel these missions detract from what the foundry is for, as in play a story the player has made. The Nagus missions are an exploit and the missions will probably be removed again. I did try them once just to see why they were so popular and IMO I was not impressed.
As for the author of these missions, you may end up getting granted an EULA rule forbidding these types of missions, DStahl has already said he will be pushing to have them removed (as it seems has already happened once). I have a feeling this will be fixed alot faster than the problem with replacing Ker'ret. So enjoy it while you can, I don't endorse these cheat missions in any way since there are some terrific episodes to play in the foundry and want these exploit missions removed permanently.