As a total bombing amateur, the planting of 1x1000lb'er, a third along the length of the runway at Stanley does actually make some sense.
1. It reduced the TODA/LDA to Argentinian jet fighters.
2. As already pointed out, it certainly made a 'point' that the mainland wasn't immune from a visit.
3. And if you want the ground troops to capture the only airfield (with a viable FJ runway), that you'd wish to use later, it would be better to have only 1 hole in that runway, rather than 21 it could have possibly have!
Anyway, at the end of the day, it was a bloody good effort all round.
Sorry, just my 2 cents.