To be honest, we're just not fans of SocialEngine. SocialEngine has been a confusing company to do business with and the developer atmosphere isn't what we consider healthy.
That said, we're huge fans of PHPFox, a SocialEngine alterenative. They're great to work with and very developer-friendly.
We have an online store for PHPFox plugins at Konsort.org. Check us out!
You can find our corporate site here. We're a small team of four and we write custom code for a living. If you've got a project that needs creating and a minimum budget of $2,500, we can help you. Contact us using our form on that site.
No. Probably not. Maybe. It's classified. Basically, if SocialEngine's team got a hold of us and told us they were releasing a new app store where SocialEngine customers could buy our products directly through their admin control panel (or something like that - similar to how Wordpress plugins work), we might be interested. Short of that, we have no interest in creating plugins for a system that wont help us sell it.