This is a very simple mod that increases the rocket capacity via a option. Default is 1 ton.
Known Bugs:
If you set rocket capacity too high the game will say "not enough to fill one rocket" on landing pads and just wont let you auto request stuff. Not something I can fix unfortunately.

Workaround: dont set it too crazy high (like under 10000kg works) and it'll be fine. If you really want it that high you gotta load and launch rockets yourself.