It was certainly an irritant that the CSA, having managed to pull of Foreign Entry in a recent pbem, had to pay -3 NM & -142 VPs to put Longstreet (seniority: 10) in command of a new army, because British General Sir William F. Williams (seniority: 7) "expects to receive command of the next army." In Real Life™ an absurdity of course.
Just a thought, but a quick fix might be to simply give all foreign generals very low seniority ratings in the next patch: rate them all 90 - 99 for example.