Standby altimeter set and left in QNH *while during descent or just before top of descent in an anticipation way , before being cleared to an altitude.
It's not addressed one way or another in our company SOPs, customarily we set QNH in our ESIS when received at TOD.
Accepting intersection take off on ATC request although performance data for that intersection is not available "we can do it as it is just 50 meters shift, no problem"
Hypothetically, if you had 1000 meters more pavement than you needed and you were 20% lighter than your climb limited MTOW for the conditions, would you say that safety had been dramatically compromised by giving up 50 meters of runway?