CYP,
From my own experiences. I have found that the appointment of elders is very personality driven. Yes, the wives may do that sort of politicking in service or at a gathering. However, the society is and has been for some time short of elders and ms. The bodies of elders would like to make as many ministerial servants into elders as possible. They're supposed to work with the ms in the hall to help them qualify for elder. There are lazy BOEs who don't do this and there are bodies who are really good at doing this. The point is there is no specific number of elders a congregation cannot exceed so any good ms can be appointed regardless of the number of elders. There are of course BOEs who loathe to appoint any ms into the elder role and therefore some ms move to different cong. to get appointed there. I've even heard of cases where an ms will move away to get appointed and then move back to the original cong. to serve.
As far as politicking for positions within the body. Each body is different. It all depends on the makeup of the various personalities. If there is a strong personality that leads the other brothers, he can be a kingmaker or a king - his choice. By king I mean PO or secretary.
Since it's all personality driven the best thing an ms can do to get appointed is be regular at meetings, comment a lot, give well prepared talks, go in service regularly - or do nothing and kiss a^$ or be related to an elder!!