No, Chartroom does not have public-facing entry forms. These will be specific to the sport, organisation and event.
Not advisable. Google Sheets has an offline mode so entering scores for Pool play could be done at a pinch. There is no access offline to the Chartroom menu however, so Lives play would not work.
No problem, Chartroom is very flexible and supports custom pool play charts for established legacy events. See the examples at bowlstawa.com for inspiration.