Yes, but why would you want to? In stock EV, Earth and Stardock Alpha are defended by 3176 Confed Frigates each. Mars and Luna are defended by 3176 patrol ships and gunboats. What this is is BORING!!
Most of the other planets have only one or two types of ship, usually weak, in their defense force. Even though the numbers vary from planet to planet, there is not much challenge to blowing away Defenders or even Rapiers.
My solution to this problem was to make a little plug which modified the defense dudes (there are only about eight of them) to make them more unpredictable. Each dude resc has room for four different ships, so there is plenty of room for diversity.
I also modified the numbers for some spobs, some like Earth and Ruby were reduced, but some of the others were increased. No planet has more than 400 defense ships.
I also beefed up the Bounty Hunter (he's a pers resc, so its easy to do) and made him a pirate.
I've never published this little plug (named "Modified Defense Fleets"), but I can upload it if there is any interest.
T.O.P.
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"Good mathematics is not how many answers you know,
but how you behave when you don't know the answer."
The Old Professor Houston, Texas