Like if you've been batting off for half an hour opposed to 5 minutes? Yeah, I notice a difference when I've had erection for a long time. Can shoot that shot over my head too when the pressure is up.
It varies from guy to guy (and can depend on how frequently you ejaculate), but in general edging does seem to encourage a little more ejaculate to flow. Edging is great fun and good practice, helping a guy learn better control; it does make the tool sore (if very, very happy), so using a first rate penis health cream (health professionals recommend Man1 Man Oil) is a good idea. Look for one that includes vitamin A, because that can help ward off nasty penis odor. Just sayin'.
"....can help ward off nasty penis odor. " You say that like it's a bad thing. If you really want to increase the amount, drink extra water. If I drink 5 eight ounce glasses of water for a couple of day, the next day I'm cumming like a fountain. Yeah, you'd think you would just pee out the excess--But, try it and see for yourselves. Let me know your results, but remember, give it a few days.
I don't think you cum more, but I sure cum harder when I edge. I've edged for hours (I think the longest I edged for was 8 hours), and when I do, I alway shoot hard and far! Hitting the wall behind my head, or making a mess on the screen.... etc.
Absolutely the amount of foreplay or time spent being excited whether its beating off or watching porn or flirting or whatever gets you excited can definitely increase the load size as your body starts creating more seminal fluid. Heck I and I'm sure others have had pre-cum drizzle out just from being in sexual situations where there was no physical contact. So that said yes, if you want to increase your load for the grand finale, then masturbating a few times till you almost reach climax is a good way to achieve this. That said you need to be careful as if you get too close to climax and then really struggle to keep from climaxing you then actually delve more into edging which can actually clog things up and make you have a smaller cum and can lead to some discomfort.
I go harder and have more, and like someone else was saying, it sprays all over the place. I used to "edge" all the time because I was impressed with how much would come out and far it would shoot.
It's more intense, it shoots farther, but more? Unfortunately, I think that's a myth. It well documented that on average men cum about a tablespoon. I've had intense cumming shooting what I think is all over, and I've had quick ones that just kind of ooze out. Pretty sure it's the same actual amount in the end.
