Actually, what I'd prefer here is for Alex to implement moddable AI - it's a thing he's mentioned he wants to do anyway. At which point, we'll be able to add hull mods to adjust PD autofire patterns ourselves.
For example, I think a good burst PD AI might: given N charges, always keep N-1 in reserve (i.e. only use the sustained firing rate) when shooting at shielded frigates, or destroyer or larger targets (regardless of shield status). Or, for the Guardian, prioritize fighters but don't shoot at any missile smaller than a torpedo. But, without being able to test this myself, I don't actually know if it'd be useful behavior or not, or whether it's better, worse, or just different than any of the other suggestions in this thread.