Sorry for the dramas mate, I hope your arm heals ok... The ST isn't the lightest bike around...
As for the oil leak on the right hand side, check the tell-tale hole on the front of the motor, on the right hand side of the water pump... It's a tiny 1/8" hole and is common to leak oil through there... Probably best to pressure clean the motor first then will be easier to identify the origin...
If the oil is higher up, it could be tappet covers....
As for brass in the oil, doesn't sound good at all I'm sorry to say. If the crank if big end bearing are wearing through the White metal, you might see brass filings, but will be very fine... Does the motor have a slight knock ?
A good way to tell is to run the motor, put the front brake on in first gear and with a slight rev, let the clutch slowly out.... This loads up the motor and knocking will be more evident... But certainly I wouldn't be doing any long journeys until the issue is solved...
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