*$_ = sub ... doesn't work if $_ is an integer.
Not true. Did you try it? 
$ perl -we'*$_ = sub { print "I am 1 $_[1].\n" } for 1; $x = bless {};
+ $meth = "1"; $x->$meth("world")'
I am 1 world.

[download]
$_ isn't a lexical, so it doesn't get captured, producing "I am world" for output.
Correct.
What's after the -> has to start with a $, so do { @ARGV } wouldn't work even if it did return a scalar.
dragonchild was responding to my suggestion that ->do{} be made to work.

In reply to Re^6: Dynamically constructed function calls by ysth
in thread Dynamically constructed function calls by WalruZ

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