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The broken shaft is the alternator drive shaft. The gear that drives it (from the clutch intermediate gear) is the infamous Z25, the cause of the 1130's "Hot Start Fault".
Also in that top pic is what looks like parts of the sprag clutch. It is driven from the starter motor through another gear set, to start the engine via the alternator drive shaft. (One busy shaft!)

The 2 pin Superseal connector in the bottom pic should be connected to nothing other than a blanking plug, until you upload a new map, when the 2 pins are shorted to enable the upload. This is a feature of the Walbro/Athena ECU.

There is a possibility that your throttle grip has been changed to one that gives an increase in throttle opening vs twist. Something to look into anyway. My RXV550 had such a grip installed. It made a very willing bike into something almost unrideable in traffic.
 

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is it a worry for the rest of the engine that this shaft broke
Not as far as I've heard
... a known weak point for example the sprag clutch?
It probably failed and was replaced. It's not common, but there are a couple of instances.
Is there a easy, reasonably cheap way to test this theory re the grip being the cause.
You'd need to compare yours with a new one to see if the "cams" are different. Basically, a quick throttle pulls more cable at the start of the movement by increasing the radius close to the nipple holder. A slow one decreases the radius in that section. That's probably what you want.
Here's a post from a KTM forum that describes how to do it yourself
 
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