AOE3 is pretty modder friendly. If you're comfortable modifying files it can be done. If you open your AOE3\Data\Techtree.xml in notepad and search "HCAdmirality" about 10 lines below that is the start of the ship build limits.
(NOTE:Backup the techtree.xml file before changing anything, you can't play online with modded xml files, and helps if you accidently change something that crashes your game)
You'll looking for something like this:
Quote:
{Effect type ='Data' amount ='2.00' subtype ='BuildLimit' relativity ='Absolute'}
{Target type ='ProtoUnit'}Galleon{/Target}{/Effect}
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There will be an Effect Type right above the Target type for each ship. Change the "amount ='2.00" to any number.
I haven't tested this but it SHOULD work. If you're playing German, you'll probably need to search for 'HCAdmiralityGerman' instead and change the amounts below it.