I don't see what the problem is using split shot under an indicator with a glo-bug or roe flie. Its still fly fishing since you're using fly tackle.
Because its more effective to fish this type of presentation with bait (or roe lures) with gear. Some people dont think this is fly fishing, and would use a float fish rig instead. There is nothing wrong with that, just peoples thoughts and opinions. Personally, Ive had a roe fly, a swivel, and and an indicator, because at the time, it worked. The swivel as I had no split shot. I probably would have caught more fish with a float and pin setup, but I dont fish with gear. Whether people like TayC think its fly fishing or not is irrelevant, and they are allowed to have their own views on the subject. So there is no problem, but it sure isnt the most efficient way to fish, and when you start getting into some heavy flies and weights, and an indicator, it can be a nightmare to cast to where you need to. Absolutely horrible.
For the single egg pattern, I do egg yarn, with lead and an orange tungsten bead to weight it. That thing drops through the water column quite well! Also, as said, I use a floating line, and use the tip as an indicator. Adjust your leader length accordingly, I do one and a half ratio of water depth to leader length. 6 feet of water, 9 feet of leader.