Having to bend over and chase your child while holding on to the seat stinks. Your back gets real sore, real quick.
I went searching on E-bay for a handle of some kind that attaches to the seat post to make this easier. I found one made by an Australian couple that is AWESOME. Product quality is just amazing given the price. The attachment point to the seat is a nicely machined solid piece of anodized aluminum. Shipping to the US was quick, about a week.
Nope, don't know these folks, just putting in a plug for a little guy out there selling a great product.
http://cgi.ebay.com/Push-me-Home-Parents-push-handle-for-children's-bikes_W0QQitemZ150101820609QQcategoryZ64647QQssPag eNameZWDVWQQrdZ1QQcmdZViewItem