[dartho]

Adding google as a custom user agent string is done via the "Custom User Agent String" section in AdminCP - I just added "google" You could add as many spiders as you want assuming they have unique usert-agent strings, but you'd have to do this manually

Some might suggest that the mobile style is more SEO friendly as it has little markup and lots of content - but I have no real knowledge in this area, and did not design it for such.

As for showing text in links - I assume you mean alt or title tags. I don;t know how google treats these, but it wouldn't take much to add them in to this style if one was keen.