My ex and I have had a 50/50 arrangement since our daughter was 5 and she is almost 11 now. It works well for us. My schedule with her looks like:
Week 1: Sunday, Monday, Tuesday, Friday, Saturday
Week 2: Tuesday, Wednesday
The longest either parent is away from her is three days. My ex and I are true "co-parents" and discuss our daughter and her needs often, and are able to change the schedule to meet our needs as they arise. Yes, we schlepp her karate gear and school backpack and stuff back and forth. She's gotten very good at making sure her school things and anything else she needs or wants is in her backpack and that always goes with her. She has clothes and toys/bike (and pets) at both households and she is allowed to bring whatever she choses to either household (except the pets...although I did know a family who purposefully got their daughter a dog with the understanding that it would go with her between houses).
We don't exchange "child support" at all. We have a joint bank account and we each deposit an agreed upon amount into that account monthly, based on our incomes. All our daughter's regular expenses get paid out of that account (except for food and activities done at either home). We discuss larger purchases, but the normal ones are just understood.
These arrangements were done through a mediator at the time of our divorce and we've since not paid a dime to any mediator or lawyer. We deal with changes together as they've become necessary. We committed to that at the beginning after living through years of expensive family court hell with his first ex as we raised his first two kids.
It's great that your daughter wants to spend more time with her dad, but you and he need to be able to talk about this, agree on a trial period (I think that would be best), avoid this change becoming all about money, and deal with the day-to-day details of school, activities, homework, and all that. I would ask him to have that discussion soon.
ADDED: My daughter has never missed a birthday party, sleepover, extended family event on either side, or other activity she wants to do at school or with friends because of our 50/50 schedule. It is possible to put the child first and if parents live close enough to have 50/50 time, then it's their choice whether to deny these things, it's not the schedule's fault, it's the parents'.