There is no perfect game. You can find bugs and glithes everywhere.
This is a list of known current or fixed exploits/bugs.
More than 4 afterburners : Edit
Go to a ship (like tarantula)
And drop the repair robot with the new drag and drop system 0.13.1(as you know the repair robot doesnt work in organic ships).
Now to you can have more than 4 Afterburner in one flagship, but is it faster? I don't know