Map banning for premium players, when it was introduced, was a very nice feature. However, with the introduction of more and more maps, it has lost almost all relevance, especially because maps that are very similar are usually paired, like (Seversk and Test Site). Therefore, having an additional ban could make the game less frustrating.
An equally problematic issue that has always prevented this from happening was the combined ban of a four-man squad. With strategy, they can eliminate four maps from the pool, which would become eight with the increase. Therefore, I suggest removing this feature and only leaving the ban to the squadron leader while still leveraging the banned map as a stronger dislike to try to avoid playing it.
In my opinion, this can only improve the player experience, considering that most of the time you are at best in a two-man squad.