Micha Feigin wrote:
Is it necessary to use ert for \and when multiple authors are used,
Yes (AFAIK).
or is there a lyx way?
Haven't found one. Hypothetically it might be possible to cobble together a layout file that dealt with this by having two author environments (one for the last or sole author, one for any author other than the last), but I think it would involve convincing LyX not to stick a blank line (or bunch of blank lines) in the exported LaTeX file between author fields, and I don't know how to do that, or even if it's possible.
You can, of course, bind a key combination to insert the \and in ERT. The sequence to bind would be something like
command-sequence ert-insert;self-insert \and{}; /Paul