I have a feature request: autodocument method parameters at their invocation calls by inserting parameter names as comments.

Just as there is a menu option 'Format', Please add a feature as described above that will pull the variable names from the method definition and insert as comments next to each field.

Instead of bar.foo(null,null,"!@#$%@", "ASF"); 

We will get

bar.foo(null/* id */,null/* permanent */,"!@#$%@"/* mailstop */, "ASF"/* join date */)

"I sometimes find myself manually commenting arguments in a method call".

Exactly! Now imagine if you could place your cursor on a method invocation and select "insert method parameter names". A broader brush would be to "insert method parameter names on all usages" of the method.

Anil