As far as I know, interactive cockpits are not possible in FSO, and in most cases, even if they were, the player would not want to use them due to the usual gameplay of FreeSpace. Now, it would be quite cool to have things in the cockpit that change due to your own actions, but the main thing you'd want would be working displays.
FSO doesn't lend itself to clickable controls, and if it did, using them would be inconveniant. I'm speaking of something different here - having a control object library is useful as it lets the modeler rapidly build the cockpit from a library of standard parts which an aircraft or spacecraft would most assumably have at some level. Again, this is probably something which wouldn't work as well for FotG due to the diversity in cockpit design, but if you can pull it off, it might speed the process up quite a bit.