A player brought in to substitute in a ​league team from another league team may play at 1(Lead) or 2 only.  If the substitute is on the reserve list, (s)he may play in any position.

Bonus Point for eight ends

A bonus point will be awarded to both teams if a scorecard is submitted showing a shot or shots scored in the 8th end.  Normally, this will mean that the 8th end will be completed.  However, when one team is so far ahead after 7 ends that the skips agree to shake hands, one stone should be thrown by one member of each team nominated by the skip and the winner awarded the score of ‘1’ for the 8th end.
We do not have a 'rule book' as such and anyone wishing to know how the game should be played should consult the RCCC rulebook ( the first paragraph of which includes the statement

While the main object of the game of curling is to determine the relative skill of the players, the spirit of curling demands good sportsmanship, kindly feeling and honourable conduct. This spirit should influence both the interpretation and the application of the rules of the game and also the conduct of all participants on and off the ice