It depends on your specialization and play style. Do you craft everything yourself or do you loot ? What weapons do you use?
For example, I used explosive crossbow bolts for the horde in one playthrough. I used 100 glue per week for that alone. Add to that the glue I use for the repair kits. Since I repair all items before I sell them, I use a lot of repair kits.
It also depends on whether you are in the early, middle or late game. In the late game you have practically too much of everything, in the early game you have practically always too little. You chop up leather couches to get leather and collect all the bones you can get your hands on to have enough to craft everything.
Due to the high growth rate, you don't have to plant as many trees. Since trees have a big impact on the FPS, you don't want to have many of them in your immediate area. If you want you can mod the growth rate to match what you want.
Children zombies are a controversial topic and the developers of every game they had so far had to take criticism. Moreover, they risk being banned in some countries. The Fun Pimps will not risk this just to satisfy a minority of players.
If you need small agile enemies in a game you can also resort to animals. I think the zombie dogs and vultures fill this role well in 7 Days to Die.
I doubt that something like that will come. Burning zombies are already a lag-fest.