Personally, I think you should go for making her pay for your attorney fees. Our attorney has asked for fees the last couple of times we were brought to court. Although we haven't actually gotten any fees yet, we were able to come to a compromise agreement on fees, and so far, so good.
Going for full custody seems like it might be harmful for your child/children. It I understand correctly, you aren't complaining about support, etc, simply the ongoing litigation.
I am biased by my own situation, obviously, but I do think there's a point where a parent shouldn't be able to use the law to harrass the other parent, nor to drive them to the poorhouse.
Parents should always be obligated to pay for their children, that is not in dispute. The dispute is when one parent has much more money than the other, yet uses legal manuvering to get out of paying his/her far share of support or to continually harrass the other parent. In our legal system, it is often the person who has the most money who wins, not the person who is right. In our case, there are many issues we could "win" if we could afford to fight them through. However, when faced with the significantly more money the other party has to spend on attorney bills, there is often no choice but to eat it.
As to support, it seems unfair for one parent to pay 100% of the support of a child when the other parent clearly has money, and the ability to work. We're not talking staying home with an infant or young child here. We're talking the parent of school aged children, who has independent income to care for herself, refusing to acknowledge that she has an equal responsibility to provide some financial support for her children. In this case, the father spends 50% of the time with the children, so the mother can't even argue that her "support" is paid in personal care of the children. Both parents are providing equal personal care, and one parent is providing no financial care of her children, plus causing the other parent additional money by repeatedly
causing him additional legal expense.
I am a SAHM myself, and totally think that children should be entitled to that. However, if your children are in school, and they spend half their time with their dad, it seems that you could get a part time job at least. If you choose not to, then you should still be obligated to provide some of the financial support your children are entitled to, however you choose to do that. The father shouldn't be forced to subsidize the mother's life choices forever.