I don't think this is possible with the current variables available for the blog page. The shelf page has the following variables:
{{ pages }} Number of pages
{{ page }} Current page
{{ pageHref }} Pagination URL
The blog page has the following variables:
{{ page }} Current page
{{ isNextPage }} Next page of posts
You'd need the number of pages at least in order to make a range equation, the pagination URL would make it easier to implement the page url but I can think of a few ways to get that done already. The only problem is not knowing the number of pages since then you'd have {{ page + 4 }} outputting something like 9 when you only have 8 pages. Heh, I hope that makes sense.
I'd suggest making a suggestion post for them to add those variables to the blog page template. The list of current variables can be found here:
http://booklikes.com/template/docs
ETA: Infinite scroll is a possibility with the current available variables if you implement jQuery. Information on how to implement that, here:
http://imakewebthings.com/jquery-waypoints/shortcuts/infinite-scroll/