Hello,
1) I have not heard of a Starfire Mod. Sorry.
2)
Play By Web Rambies B5 site And my site for star trek, link below. Data files are included with all ship sets. There is a TREK mod that can be downloaded from the PBW site.
3) Yes I believe so. Look in the VehicalSize Text file.
4)Drones were going to be added to the final game, but MM opted to not include them. Drone discussion was a hot topic for a while, but as it stands, drones are nothing.