LumenRT - Disappointment

I have to say Im disappointed with LumenRT.  I've been using it for a few weeks now and have picked up many gripes with it but my biggests relates to the content that comes shippped with the software.

I have the latest update 12 on my machine and the content is very American, which doesn't suit me in the UK.  Further to that it seems there is no option to extend the content libraries or make your own?  Looking to start a discussion abou tthis just incase Im missing something 

Thanks