"I've been shouting about it for ages," said Jefferies, who believes the SPL would be made better by the inclusion of sides like Dundee, Dunfermline, Partick Thistle and Inverness.
"There are some good clubs in the First Division; there are some good facilities.
"If they were all back in the top tier, they would get bigger crowds - that's a fact.
He added: "The quicker we get back to playing home and away, the better, I think - whatever the size of league, whatever the format.
"Playing each other four times has had its day.
"We're getting too familiar with each other - we know each other's games.
"I don't think there's any motivation for the supporters to go twice to see a team at home."
Jefferies acknowledged a 12-team division made the competition exciting.
He added: "You've still got to have that but, at the same time, the way that it's set up now isn't helping the football.
"And that's the main thing."
Source: Team Talk
Source: Team Talk