My son is almost 8. At lunch time he enters all the info into the pump and the nurse just double-checks before he his "OK". This is new for him, and so far it's going good. Not sure I'd trust him to do it by himself tho....
He has breakfast at 7am. Lunch at 12. His class snack is at 9.30. I have his I:C set so that he can have a low car snack (6-8g) uncovered, and he'll still be in range at lunch. I know this works out OK for him as we check his Dex log for the day and there are no major fluctuations.
Twice a week he has PE straight after snack, on those days I don't mind giving him a few extra carbs to hold him over.
Things I give him include:
Carbmaster yogurts: 4g
Cutie satsumas: 7g
Freeze dried fruit: 7-9g
Trailmix: peanuts, pumpkin seeds, small amount dried fruit and choc chips: 5-9g (I mix this up myself so can literally add just 1-2 choc chips to keep him happy!)
small jerky sticks: 1g each
Sugar-free cookies: 2 for 5g
I also find those individually-packaged treat size Goldfish and other cracker-type things - usually the Holidays such as Halloween, Valentine's etc.. are a good time to pick these up.