Wallace came on in the 87th minute of the Gers' 2-0 win over Aberdeen at Ibrox in April.
It was interpreted as a chance for the 31-year-old to say goodbye to fans after spending eight years at Rangers - and staying through the financial turmoil which threatened to destroy the club in 2012.
The former light Blues' captain, who skippered the team back to the Scottish Premiership in 2016, hadn't played under Steven Gerrard since December and the writing had been on the wall for Wallace for some time in Glasgow.
Rangers suspended him and Miller toward the end of the 2017-18 campaign for a verbal tirade aimed at then-manager Graeme Murty following a heavy defeat by Celtic in the Scottish Cup.
The Glasgow giants didn't acknowledge Wallace's departure earlier this summer in any way, prompting criticism from the fanbase, and Miller, who spent eight years of his career with the club, wonders whether his former team-mate would have wanted to say goodbye in the way that he had to settle for.
He told The Glasgow Evening Times: "Lee got his wee cameo towards the end of one of the games didn’t he? Personally I don’t know if he would have wanted it.
"But it gave the fans a chance to show appreciation for the service he had given the club right through the journey from the bottom back to the top.”
Better days lie ahead for Wallace, who has been snapped up by QPR boss Mark Warburton after working with the English manager at Rangers for a couple of years.
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