I think It would be a good Idea for the cruisers of STOL that can't saucer separate ( TOS Consitution class, Excelsior class,etc..) to have the ability added to jettison there " nacelles'' as a new console to
help aid the ship in battle like plasma eject..or maybe even a warp core eject option ..
and re-attach after the battle is over.... After all the saucer comes back after its been destroyed!
The Connie could (soft-canon wise) "blow" the saucer off the secondary hull, and be re-attached at a starbase.
It was a "worst case scenario" thing.
Quite so. The only thing that made this worthwhile in the Galaxy class was the ability to re-dock in flight and that the saucer section had its own warp drive. Lacking both of those, a Federation ship that jettisoned its warp nacelles or seperated the saucer section became a sublight ship that could only use impulse engines to make an emergency landing on a planet. In game terms, blowing the nacelles or seperating a non-Galaxy/non-Odyssey class saucer would result in a ship unable to leave the system map. Ever.
Note that Klingon ships also had 'boom seperation' that worked the same way. Unlike the Federation, the Klingons never saw a reason to break apart a perfectly good warship in the middle of battle, and decided it was more worthwhile to work on making the ship as a whole perform better. Then again, the 'boom seperation' was a relic of the days when Klingon ships had slave crews assisting in the Engineering section, and seperation was considered an acceptable solution to a rebellion aboard (followed by the remote detonation of the warp core, of course).
ALL ships with a saucer section have the ability to separate the whole point of the saucer based design was to in an emergency load the crew into it and blow off the engineering section.
Only a few before the advent of the Galaxy class could reconnect without the aid of a spacedock.
This is the primary reason for having the impulse engines on the saucer both as a way to move the ship and as a way to power it (and give weapon functionality) via impulse reactors.
the saucer and engineering section configuration also means a wide weapon angle of attack with a minimum forward silhouette for an enemy to target.
These are the only reasons ships are made like this in canon.
in reality is recognition and company design continuation for franchise which oddly enough has become so well known that even now fanboys and girls whine when a fed ship lacks the classic design format.