Chasing 227 after a bold declaration from Australia's Michael Clarke, England were 21 runs short of their target with four overs remaining when bad light forced the players off the field.
"Where I think the ICC could improve the regulations, and we've spoken with ICC officials about this for years, I think the description that they use when judging bad light and when they consider whether it's dangerous or not - often it is not dangerous and it's a poor description of that particular regulation," Flower said.
"In my opinion it should be whether the contest between bat and ball is reasonable and fair. If there are spinners bowling, under their regulations at the moment it almost means you could play until it is dark because it's obviously not dangerous."
Despite the 3-0 scoreline which secured England the famous urn for a third consecutive series, they have come under fire for some of their performances but Flower rejected suggestions his side was more workmanlike than exciting.
l Australia coach Darren Lehmann has promised to learn from the Ashes controversy sparked by his scathing attack on England's Stuart Broad.
Lehmann, last week accused Broad of "blatant cheating" following the pace bowler's decision not to walk after edging a catch at Trent Bridge.
Lehmann also called on the Australian public to make life so difficult for Broad during the Ashes rematch in Australia in November.
The comments earned Lehmann a fine of 20% of his match fee from the fifth and final Ashes test.
But the former Australia batsman, who took over as coach at the start of the series following Mickey Arthur's departure, says he has now spoken to Broad to draw a line under the incident.