The stock Bosch parts have definitely been surpassed by better options. An old bike with modern electrics makes me happy.
I borrowed a r90s for several weekends. It had Del'orto carbs and dual plugs. I guess technically it was faster than my bone stock r80 but I think saying that it's a 'lighter shade of slow' is more accurate. It got worse gas mileage.
Dual Plugging threads can sound like oil arguments. You'll have people on both sides argue 'til they're blue in the face. Most will agree though--it's not easy to get it right. You can always do it later if you want to. It may be a better idea to wait on that one.