I've seen (and offered) suggestions that it might be a reasonable houserule to allow a weapon with Linked and Slow-Firing to use the two traits to counter another by firing the weapons sequentially instead of the usual simultaneous firings.
For example, a twin light turbolaser normally has Linked 1 and Slow-Firing 1. Both qualities are of equal value so they could cancel. This would represent one turbolaser firing one turn followed by the other turbolaser firing on the next turn while the first is in it's down cycle. To do the same with heavy turbolasers, you would need a triple mount - Linked 2 - to cancel the Slow-Firing 2.
As a side note, when using this option with weapons that have Limited Ammo, multiply the Limited Ammo value by the number of launchers (which is Linked value +1). Proton torpedo launchers with Linked 1, Slow-Firing 1, and Limited Ammo 3 would thus have Limited Ammo 6 if it elects to drop Linked and Slow-Firing. This means six individual torpedoes could be launched rather than three pairs of torpedoes.