^thanks for that tip Attronarch 
There is now a pro version ($3.99
) - it looks like you need the pro version if you want to select just part if the PDF's.
Strangely, they partially hide what the pro version does (see below) - and dont seem to do any straight-forward comparision on the site, but Pro obviously includes Rotate/Watermark/Secure (and I *think* selecting pages from PDF).
(see attachment in previous post)
-tomos
To be honest I immediately bought pro version since I've been using the tool for long time. It has several quirks that should be addressed soon. The author is receptive to feedback, and I believe that the GUI will be even better when he updates it. Anyway, I don't think that you need pro version to change which pages you want to work with - just double click on the pages in the right column.
I recently was working with a lot of contracts and stuff that were being revised constantly, with multiple sets of documents that needed to be merged and inserted, etc. all the time. I used this program:
http://www.debenu.com/
It basically allows you to create methods of batch processing a bunch of pdf operations. For example:
--open document 1
--insert pages 3-5 of document 2 after page 40 of document 1
--merge this new document with document 3
etc
very handy, very speedy. saved me a lot of headaches. a little quirky and buggy at times (sometimes it would just crash). but overall i was very excited about it.
-superboyac
I've tried using Debenu products, but with little success. They were slow, they would crash, and sometimes they just couldn't deliver what they advertised. But I might revisit their products, who knows maybe they are better now.