I think they meant more than eight.
Basically, there's two halves to this request, and one of them already has a topic. So, if you want to contribute ideas for a "back of Trainer Cards" idea, please post them in this thread:
http://pokecharms.com/threads/back-for-trainer-cards.9748/ (I'd like to hear any suggestions and whether people want this!)
As for more than the current limit of badges on a card, this is unlikely to happen anytime soon for a reason that plagues a lot of TCM suggestions: assets. Essentially, I'd need to partially rejig the TCM generator to allow the backgrounds themselves to specify how many badges to take (easy), and then somehow convince people to submit lots of card backgrounds that could take lots of badges (a lot harder.)
There has also been a lot of discussion regarding this among staff, and basically it's quite difficult to put so many badges on a card in the size we make and still make them look good, especially as you'd need to leave space for all of the other elements - trainer name, sprite, friend code, six Pokémon, etcetera. That's why the limit was set to 8 back in 2006, with TCM1, and why it's stayed the same ever since. I personally do not see this decision changing any time soon.
Any requests for more information on your card (the wins and money, for example), should be either in their own thread (if you'd want them on the front) or in the Trainer Card Backs topic posted above..