The pass is only as useful/valuable as those who do or don't practice it. To each their own, for sure.
Do any one of you guys happen to be musicians? I view the pass as a scale. Growing up, I practiced scales mindlessly (because my teacher told me to), not knowing what they were truly useful for. When I finally went to school for music, I practiced them so much I hated them.
But in the end, the scale is the building block of all songs. In music, 12 major and 12 minor (each with three variations) exist. Will musicians ever use them all? Not at once, but when time comes, we do! Same for a pass. Learn it. Master it. There will be a time you will find it more suitable than any other control.
Now, let me address the issues that you brought up?
"1. ....Often when I pull the packet to the side at the start of the pass I find that it gets caught on the fingers of my right hand. Have any of you had these issues? If so how did you solve them?"
I've been practice the classic pass and its variations for well over a decade and still somewhat remember when I had this problem as well (and I have pretty big hands). Could it be that you are gripping the deck with your right hand too deep? The front edge of the deck shouldn't be held further than the second "joints" or "folds" of your right fingers. Kind of hard to explain through text. If you're willing to upload a video of you practicing, it'd help us a lot.
"2. I find that the flash on this pass is MASSIVE. To be fair I am quite certain that this is a practice makes perfect and you're going to have to build speed deal, but when I get the pack out to the right it just seems like a blind man could see the packet, you know? Is my covering right too far over of the deck or is this why all the books I'm working with call for distractions with the pass?"
If your pass isn't smooth yet, do not worry about angles yet. Think about it as learning how to "crawl before you walk." When you get the hang of the basic mechanics, the angles will almost naturally get better through muscle memory and then you'll be able to adjust accordingly.
"3. For the life of me I can't get my left thumb to lie naturally along the long side of the deck while I practice. I'm contemplating gluing it to the cards its so frustrating for me. Naturally my thumb wants to be up against the middle joint of my right index finger when I'm passing. Is this going to be a problem in the long run?"
This is something that I've just recently been working on. It's a preference and it will not affect you negatively in the long run. I don't find that lying the thumb along the long side of the deck to feel natural, but I think with the thumb out of the way, it may lead to the top portion to clear faster. For now, I suggest not doing it because it really isn't natural. If you're ever interested, I'll let you know how it affects how I do the pass because I plan on practicing it like this for a bit.
"4. Finally, do you move your right hand? I'm still so bad at the classic pass that I'm lucky if my cards make it out in one packet by the end, but I find that if I don't move the right the packets slide against one another making a ton of noise. Then again if I do move the right I'm worried that I'll call a ton of attention to the move. I know that I can riffle or jiggle pass to lower suspicion, but is that the only option?"
Yes. I do, anyway. I curl my fingertips in a bit to help bring the bottom packet to the top. Depending on the situation, I may even rotate my right hand forward (fingers towards the floor) to get some more cover. As for the noise, I personally strive to not have both packets touch when executing the move. I say that because of my understanding of physics. More friction is created when two solids touch and therefore will create noise and drag, making your pass slow. If you can get the two packets to clear without touching, it'll be frictionless and therefore faster. Some people have told me that the packets travel farther when they don't touch, but I'd rather work a wee bit harder and make less noise than the opposite.
I hope this helps man. Let me know if you have any questions.