As you might already know datastore is primarily meant for large tabular data sets. Non-tabular/blocked reading is something we want to look at also in the near future.
However you should be able to play with the TextscanFormats to read the data you care about just as you would using textscan for reading non-tabular data. For example, as you may already know, you can set the TextscanFormats as '%q' and read in a table with one variable name with the block of text for further processing.
I could probably help more, if you provide a sample text file?
hope this helps.