I like the approach.
Here are my suggestions/ideas:
No order. Just ramblings:

- Try to come up with (MultiBit a-like?) wallets that somehow (optionally?) only download headers and don't have to download the whole block chain.
- Make native wallets for all platforms. Not Java.
- Make all wallets available (at launch!) and make sure they're tested for all platforms. Including OSX Mavericks(!). If your target is mainstream, remember that mainstream users are using OSX.
- If you give moms and pops the possibility to mine from their wallet, make it optional. Also, include 'nice -19' a-like features so that their laptops won't melt or the fans don't start screaming.
- In addition to that, in order to do 'honest mining' for everyone, keep it cpu -only and try to keep the asics and gpu's out. Use something like quark.
- As you mentioned, an installer and auto update would be awesome. However, please don't loose the view of the whole Bitcoin idea that things are decentralized. The source code should be there and if something happens to the Dev team, this coin should survive.
- Make a blockchain explorer available at launch from your website.
- Write upfront to respectable pool owners to help getting this launched and are prepared before launch.
- Inform exchanges about your plans and explain that your approach is different. Agree upon condition that are going to be met (hash rate, number of coins mined, coin age etc.) as of when they will include you in their exchange.
- Talk to processors out there and poll their interest to offer it to their merchants.
- Come up with official press releases where you explain that this coin is targeted at mainstream. Not only for the technical bitcointalk/reddit crowd with their garage stacked with GPUs.
- If you pick a spokes person, pick one with some experience and more or less independent. He can can somehow have an interest but not someone with his wallet filled with pre-mined Kreditz. Those are not taken seriously.
- Create a website that doesn't look like yet another $15 Joomla template.
- Be (and stay) communicative to your miners/speculators/users/fans by creating a forum, newsletter, twitter account etc.
- Be clear (and don't lie) on how much is going to be pre-mined. Keep it low.
- Not only use the pre-mined Kreditz to fill the pockets of the devs but make >90% of it available for bounties, rewards etc.
- Use bounties for things that help Kreditz to become more successful. Instead of only for a logo or an app, focus more on bounties for P&R, help to get Kreditz into exchanges, Kreditz Card etc.
- Don't do Givaways but do creative contests.
- Don't fuck up your launch. Roll out a plan.

I'm not saying that these things are all needed. But maybe some of them are useful.
I really hope you guys find the right approach to actually make an alt-coin that makes sense. If you do that, you'll have my full support and I will help wherever I can.
Good luck!