Install Astro File Manager
Install Desktop Visualizer
Open Astro and go to preferences. Choose "Edit File Extensions" under Data. Choose "New Extension".
Extension Name: epub (no . in there, just epub)
Mime Type: application
SubType: epub (again, no . in there, just epub)
Long press on Home screen
Add widget (In Zeam it's "Add Item" then "Widget")
Select whatever size Desktop Visualizer Widget
Select Icon (Choose whatever you want, which is awesome)
Select Action, choose "Other", Choose "ASTRO"
Find and select your file
Rename it if you choose
Hit OK for File Name
Hit OK on bottom of Desktop Visualizer
Choose Widget span, click OK
Direct link from icon on homescreen to default BN reader.
Again, thank you to Robo Ray for this simple suggestion within Astro. This is even better than the original method using Linda File Manager as this method allows you to use whatever images you want with your links.
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EDIT: This is no longer working for me. I upgraded to 1.0.1 and used auto nooter to re-root. I have no idea why this no longer works, but I click to create a shortcut and it says that it creates a shortcut, but it never appears. Also, I can't find the shortcut anywhere. Something broke or changed between the old and new root methods or with the update itself. If anybody knows how to fix this, I and hopefully others would be greatly appreciative. I'm using my limited skills to try to figure this out as shortcuts of my sideloaded epub books that open in the BN stock reader being able to be placed on my homescreen is a very big deal for me.
I figured out how to put sideloaded content like books, comics, pdf files, etc. onto your homescreen. This was, for me, the last essential task I desired. This device is now what I consider perfect. Everything from here on out is just bonus.
This is assuming you are rooted and now using ADW or Zeam as your launcher. This won't put shortcuts on your B&N Home screen, but words for the two listed above. I haven't tried any other launchers.
Download Linda File Manager (App description linked; Found in market for free, not sure where to find outside of market)
Once installed, open the app and go to your desired file. Long press and choose "Create Shortcut". It puts one right on your home screen. If you only have the default BN book reader, book shortcuts will automatically open in that. If you have multiple, it will ask you to choose a default app. PDF files and others show a list of apps and you just set the default.
I couldn't get this function to work using Astro.
One last note. I can't seem to find the books and magazines that came from BN. I am only finding the stuff that I put on my SD card. In Linda Manager, I've been searching around "My Phone" which seems to be the onboard storage and found the two original pdf guides that were on the original homescreen, but I can't find the books and magazines that it came loaded with and I downloaded.
Hope this is helpful.