Marketpress : Title problem on Product category & Shopping cart

Hello.

I think the problem is easy to describe :

In every page, the title is "PageName | MySite", but, on a product category page and in all the steps of the shopping cart/checkout, the title is only "PageName | ". The site title is missing.

Any idea on how I can fix that ?

Another small question, maybe more on WP global system than Marketpress : Is it possible to add something after the title like "PageName | MySite - Addition", only on the Marketpress pages ?

Thanks, and congrats for the plugin, really really cool !