Hi Pieter,
1. The newest version of mojoPortal 2.3.2.9 has this feature for viewing previous newsletters.
2. Sorry but I have no plans in the near future to add this complexity of translations in the WebStore or elsewhere in mojoPortal. Nothing stops you from implementing this in your own custom features though. I originally started down this path in WebStore but this leads to a too complex a model and slows down development. What I am looking into is integrating google translate as a widget that can be used in various places for conveniently translating content from one language to another by the user on demand. Its not a perfect solution but it will be something useful. If you really need that complexity you might look at integrating NopCommerce or some other ASP.NET commerce solution.
3. mojoPortal already supports extensionless urls on IIS 7 and I believe it can be configured to work in IIS 6 with an ISAPI filter.
4. I do not use DotNetPanel nor Plesk, as I do not run a hosting company. I know that DotNetPanel can use MSDeploy packages, I do not know if Plesk supports that or plans to support it.
5. Nothing stops you from using any ORM you like in your own custom development of features for mojoPortal. Just because I don't use them doesn't mean you can't use them.
6. I am planning on gradually implementing a RESTful web service API, there currently exist REST methods for authentication and roles retrieval. I do not have any plans for implementing SOAP, however nothing stops anyone from implementing whatever SOAP methods they wish to expose.
Best,
Joe