OMG, buying in mid-roll is my ultimate pet peeve when playing craps. More so if I am the shooter. I will wait until the hand is over, whether a seven-out or the point is made. Then I will buy-in.
I like to keep some small denomination chips in my pocket at all times. Usually several reds and whites. Then when I'm waiting to buy in, I'll sometimes place the point by placing the chips on the last line of the passline bar. At least I'm kinda in the game, especially when there is a good shooter.
Other players buy in mid-roll because they can see that there is a good shooter. I believe in rhythm and it might be superstitious but when a shooter's rhythm gets thrown off by these guys, it tends to lead to a 7-out. Just ask the pit bosses. They love to throw a good shooter's rhythm off. The longer the shooter has to wait because of mid roll buy-ins, or greedy players pressing the middle and their place bets the higher the chance of a 7-out.
This is just me because some people don't see no harm nor foul. Even some shooters don't care when they have to wait a long time between rolls. Part of the game I guess.
That used to REALLY bother me. It still does, but I've found a way to sort of just "reset" and wait until dice are back in front of me. I absolutely hate it when someone, generally a drunk newbie, forces their way in mid-roll, throws down money on the table, the dice hits it and then. . .
I've also been where the table has a "cooler". Where either one of the dealers takes a while or someone starts arguing over something stupid. In the former, I haven't experienced that many time, especially when the table has been tipping. I've seen some things advantagious to us/table when tipping well, as I am sure many have as well. Both craps and BJ. . . For the latter, it doesn't happen very often, but I've had it where the table is hot, running on 45+ min roll. Where generally the place bets are large(r) amounts. Then someone is arguing over a $25 field bet. Where someone on the table gives them the $$$ as essentially a "here, shut up".
When I had just turned 21 and was in Vegas with my parents. I was in downtown and got to know a few folks from Hawaii. One night, I was on the table and someone else was rolling and doing well. I was drinking had to piss! I was about to step off and one of the older guys was like "you can't right now"

So, I held it. . . roll continued, and I held it. Wasn't going to be the jinx. . . haha