Hi Tom,
I am using WP Show Posts Pro for the first time and I really like it. There are some things I would like to be able to do:
1. Images/Images Overlay Icon – To be able to pick a Image overlay icon from Font Awesome (If the theme has it, which mine does) or have the ability to add a transparent .png to the media library to use. Of course you would tell us what size to use.
2. Content/Read More Style – The option to have text only and not a button. The button style I am using throughout my site is rounded and WP Show Posts Pro does not have that option. A text only/no button option would be cool. A setting for round corners would be awesome.
3. Content/Read More Color – I need a color picker or a box to enter the hex value so I can match the colors I am using in my theme. The pre-selected colors are too limiting.
4. Content/Read More – Remove underline from button text/link.
5. Styling/Padding – In Masonry columns it would be nice if you had a seperate padding option for the image and text. That way the image could fill the container see pic 
Once again I am digging this plugin. I know you welcome feedback especially since WP Posts Pro is a new product. I hope these items can be addressed.
Thanks,
Michael Mancini