Random Sequence Flipbook Textures? Aka "Loopable" Flipbooks

Well, I’m using the Flipbook-node with time put into a Frac and multiplied with 1. Thats it, pretty simple stuff. I’m guessing all the legwork should be done inside the Flipbook node, but I have no idea where to start.

1: Is it possible to control the sequence which UE plays the Flipbook?
Like: row 2, column 4, row 7, column 3…

2:Is it possible to fade in and out of these rows and columns, instead of a hard cut to reduce popping?