i like long campaigns like the original FS 1 & 2 campaigns and Derelict and would love more of them. I'm hoping Inferno and Alliance (when all chapters are done) will keep me occupied for a while. I wish there were more long campaigns out there, but a lot of FREDers don't have the patience for it.
I don't know about FREDing for later chapters, but I could help on the storylines. I've some Ideas, including motivations for the Shivans and some answers to one of the biggest questions of FS2 "WHAT THE **** HAPPENED TO ADMIRAL BOSHE?" (like thats not been addressed in other Campaigns). Any ideas i have regarding boshe, I wont post here as - if the plot point is used - it would result in spoilers.