For those that are hired, during the gap between indoc and systems (I hear it's 3-4 months) is it accepted by the company to work other flying jobs? I would assume they would want you to stay out of trouble and not risk getting a violation or anything like that.

Aside from what they officially say, is it prudent? I.e. if you show up to systems and aren't really sharp and they find out you were working another job, that might make some waves right?