B,
Good news, hopefully
First, we have a HikaShop profile integration plugin in development. There's already a small handful of testers using it, but we haven't received nearly enough feedback on it. We honestly don't know Hikashop well enough to give it a full stamp of approval yet, and haven't had the time to sit down and make sure it works exactly how we want.
If you'd like, we can gladly send you the plugin to test. Of course, please understand it may have bugs, so you'll need to test a lot before I'd recommend putting it on a live ecommerce site.. we don't want you to lose any sales.
As for the Register button, if you can do me a quick favor? Please disable SEO URLs on your site and then go to the Hikashop register page. Then, send me the index.php?... URL from the URL bar. With that, I can get you the code to update to make the SCLogin 'Register' button go where you want.
Thanks!
Alex