In the CFL, there are no fair catches and no touchbacks. Returners HAVE to return the ball. If they choose not to do so when the catch the ball in their own end zone, they concede one point to their opponent. That being said, if the ball flies through the endzone without being touchable by the returner, the offence still get the single even if it wasn't the returner's fault. That can happen on punts, missed field goals and kickoffs (rare, but feasible).
There is no CFL videogame, much to our dismay. All of us hardcore fans would want one, but we kinda doubt the market would be big enough to support the investment needed from the game developper. There is a guy on this site (MartyMix) who re-created to the perfection the roster of all nine CFL teams for Madden 2005. That helps, but you still don't get to play with CFL rules.
Signings can happen anytime. Players in the last year of their contract become free agents in mid-February (this year, it was the 15th). Free agents are signed whenever teams need them.
Only players considered as non-imports (Canadians) can be drafted in the college draft in April. All imports (99% of which are Americans) are signed through free agency.
Teams can also add imports to their negociation list. If, for instance, the Blue Bombers add you to theirs, then the other eight teams don't have the right to make you an offer until your negociation failed with Wininpeg.
During the off-season, rosters can contain over 80 players. But when pre-season starts, that numbers has to get down to 50. And one week before the season starts, the number is reduced again to 40. So a lot of guys come here in the winter to make the teams, but most of them are cut by summer.
- QB are hired the same way all other players are. Canadian QBs can be drafted (though that almost never happen). Imports QBs are hired through free agency.
One important thing though: Each team must have at least 19 non-imports on their active roster, but QBs don't count in the ratio. So all three QBs can be Americans and they don't affect the ratio.
By the way, are YOU Timmy Chang, or are you a fan of him?