You are braver than me then. It sounds like your son has a lot of determination.
T1 unfortunately DOES stop you doing everything normal children do. You only need to read what parents of t1 young children have to say. I've lived through it myself although I wasn't as young.
Children diagnosed before the age of 4 often suffer low level brain damage because of hypos and how they affect the developing brain. Once older the brain is less susceptible apparantly. They are more likely to have no hypo awareness. Their growth can be affected by high blood sugars. They are so variable in what they do and eat each day that managing and semblance of control must be a nightmare. This is why I would stick as closely as I could to a routine to try and prevent the dangerous lows and highs.