What kinds of minor changes in the Sullan Reforms would be plausible but still make a difference.
In our timeline, Sulla increased the number of praetors and made the provincial governors, who were also the military commanders for their province, drawn from the ranks of the previous years praetors and consuls.
Arguably this independent control of both military and civil administration had some serious knock-on effects. What if we posit a minor change? Sulla increases the number of praetors even more, and now in addition to the provincial governors, there are two consuls with executive authority over the military. So Rome has two consuls who have executive authority for Italy, and who are required to remain in Rome under Sulla's reforms, and then the year after these consuls take charge of the military but are required to stay outside Italy, just as the Sulla required the military to do. These new officers would be subject to the supervision of the Senate.
Would this have any real effects on Roman history or would it collapse along with most of the rest of the Sullan reforms?