Stewart Reuben wrote:
Since Acceleration has never been computerised and, moreover, is disliked by some; the organisers have chosen to have more sections with an upper grading limit.
Although failing to guarantee the PNGCF vote for Kirsan at last years FIDE elections cost me my position on the FIDE Swiss Pairings Commission (and the Rules Commission as well), I can still report that FIDE SPP is looking at developing a standardised system of Acceleration. However at this point they are still running up against the problems of how long to accelerate for, and what to do when it stops. It is a work in progress.
On the main topic, Australia used to run all their swisses in single groups, and mainly changed to avoid the problem of having not enough rounds to find an outright winner (Typical Australian weekend events only ran for 5 rounds up until the late 1980's). We have less of a problem with 'sandbaggers' (although there are a couple of well known ones on the circuit), but do occasionally have the unknown overseas player end up in the wrong section. Offering an unrated player prize, which is the only one they are eligible for, usually (but not always) helps.
In some multi-section events we offer free entry to the winner for next years event, but only if they choose to play in the next highest section.