Question #2 Answer
Even the very best players in the World successfully roquet at 15 yards less than 50% of the time. How much less the rest of we mortals - especially if the price for missing will be high?!
Therefore, the shots on offer here are NOT as easy as they seem. If you think that (in this example) the chance of an immediate break is less than 50% for you, then probably the best thing to do is to take the shot at Black with Red. If you miss then the pressure is still high for Black, as he knows that Yellow will next go to the A Baulk where partner lies.
If Red hits then there is a great leave here as illustrated, with Red located in a wired position from Black at Yellow's wicket!
As suggested before, it is very difficult to turn down this shot.
However, I would prefer not to leave Blue at #4, as it allows Blue to then take the long shot at Yellow next turn. It is unlikely that Blue would hit, but then Yellow has no break if Blue misses.
I still maintain that normal players will not hit 6, 7 or 8 yard shots under pressure and so instead of backing themselves to hit should rather back the opponent to miss.
In discussing wiring leaves I think everyone is making this out to be much more likely than it is in reality, unless you are very lucky with where
black ends up after the first roquet red (remember it is just as likely to be near hoop 1) you probably should not even be attempting a wire.