Allow for a comma before a conjunction in a compound verb when preceeded by a compound object.
My work requires written reports of actions taken by individuals, so I find myself often using compound verbs to reduce the number of short, similar sentences; e.g., "The employee x'ed. The employee y'ed" becomes "The employee x'ed and y'ed." Occasionally, the object of the first verb is different than the second but should not be switched due to chronological order; e.g., "The employee x'ed a. The employee y'ed b" becomes "The employee x'ed a and y'ed b." This causes a problem when the object of the first verb is compound, as there is in most grammar styles an option for a comma for clarity before the conjunction linking the verbs; e.g., "The employee x'ed a and b. The employee y'ed" would become "The employee x'ed a and b and y'ed" but is clearer as "The employee x'ed a and b, and y'ed." As this is widely considered an optional comma, there should be a choice similar to the Oxford comma - preferably, "Don't check, always, never."