Adelaide suffered a 16-point loss to Melbourne on Sunday after it was left with no fit players on the bench halfway through the last term.
Crows coach Neil Craig and his Demons counterpart Dean Bailey both called for the introduction of substitute players and they were backed up by Western Bulldogs coach Rodney Eade.
Roos said he felt for Craig in the final term as the Crows succumbed to the fast-finishing Demons.
And like Eade, the Swans coach preferred the idea of injured players being permanently substituted, rather than the introduction of a cap on the number of interchanges per game.
"Because the interchanges are high, it means the quality of football is exceptional at the moment," he said.
"You don't want to take that away by limiting interchange so the way to do that is hopefully, maybe look at some sort of substitution so you don't have games decided by teams that have got injured players on the bench in the last quarter."
The Swans had no such problems with injury on Saturday night when they accounted for the Tigers by 55 points at the SCG.
Jarred Moore (ankle) is the only concern from the game, in which recruits Ben McGlynn and Daniel Bradshaw played starring roles.
Roos said the fact that so few of his squad hailed from Sydney had allowed the recruits to settle quickly into their new environment.
"Having done it myself, it's always hard leaving a club and it's a nervous time arriving at your new club. I think the way all those boys have acquitted themselves is terrific.
"We've got a good senior group now... [in which] not a lot of players come from Sydney, so they all know what it's like to relocate and come to Sydney and find your feet. The senior guys have been really good in welcoming those guys."
The Swans are unlikely to make many changes to the squad for Saturday's clash against North Melbourne at the MCG, but there are several players pressing for selection.
Paul Bevan and Ted Richards produced strong efforts in the reserves' big win against Belconnen Magpies, while Roos was encouraged by the return of young key forward Lewis Johnston after almost a year on the sidelines.
"It was good to see him back out there running around and getting hold of the football," he said of the Swans' No.12 pick at the 2008 NAB AFL Draft.
"He's going to be two or three weeks away from getting back to full fitness and then playing well in the seconds, but hopefully in five or six weeks' time, he'll be putting pressure on to get a senior game."
