1) Agreed, that is a bit annoying, but I thought it less annoying than losing your entire session by quitting if you inadvertently type Ctrl-D twice to terminate input to the ‘body-set’ command.

2) The brackets are used similarly to their meaning in EBNF to denote optional elements. The expression ‘r[euse]’ means you can type ‘r’, ‘re’, ‘reu’, or ‘reus’ as aliases for the ‘reuse’ command.