Sorry for the crap you've been through - many of us have and it's not fun.
I'll try to provide some clarification, but I highly recommend following some of the links posted on this site to see for yourself exactly what will be changing with regard to shared custody and extracurricular activities.
Shared custody: Right now shared custody parents receive a 20% discount for caring for their child 1/2 the time. Personally, I think this is like a slap in the face. In fact the documents and analysis done by users on this site suggested nearly 2 years ago that this should be closer to 75% credit. As a result of the latest committee meetings a new method will be adopted for parents who don't agree to share direct expenses. Do the child support worksheet. The higher income earner is responsible for a higher child support amount, the lower income earner, a lower amount. Take the high minus the low, and divide by 2. This compensates the lower wage earner for the fact that one parent has worked their tail off to have a better life. So, the more you make, the more you'll pay (no difference here). But, if you're not agreeing to share expenses, then you'll pay either 13%, 15%, or 18% of the total child support value from the tables in addition. This results in a 45% to nearly 80% adjustment for some cases, which is definitely getting closer to reality
Extracurricular: there is a new paragraph written about "extraordinary expenses" it calls for the higher income parent for every case to pay for 100% of all the high-cost activities, like premier sports. I have no idea what the heck this means, and I can tell you from reading the public and attorney surveys submitted by Kansans, no one knows and it will likely be a VERY gray area. I would fight this every step of the way. If competitive sports has been "ordinary" for your child for the last many years, and kids in your income bracket do them, there's nothing "extraordinary" about it. This section is actually rolled right into the "special needs" category, so I really don't know why this ended up getting passed, but it did.
So, in your case, you should pay the money for now, but after the 2012 guidelines become effective, find a change of circumstances (child age, different costs, different incomes, etc.) and file to change your CS. Do not include sports or anything else. Ask for the additional 2% reduction too because, trust me, you will be buying your own clothing at your house. You should ask her to reimburse you for clothing for the next 6 months and document that she doesn't reimburse. Then show the court that you've been buying your own stuff (keep receipts). You'll then pay (high-low)/2 + 11% or 13% or 16% of the child support table number depending on your income.
Complicated and hard to explain - sorry