The Gers frontman has Halliday's support despite miss on Saturday.
Waghorn – who had previously scored seven out of seven penalty kicks – missed the chance to put the Gers ahead when Robbie Thomson made a fantastic save to deny him from 12 yards.
Halliday and Waghorn went head to head with each other in pre-season over who would be given the responsibility from the spot and the former Wigan man emerged victorious.
The Gers midfielder has had little leverage to argue with, given Waghorn’s conversion rate, and he is still backing his team-mate for the role, despite his recent failure.
“I think he can stay on them – he had a 100 percent record before then – seven out of seven – which was a pretty decent return – and looking back at the penalty from Saturday, it wasn’t too bad a strike, but he’s still on them for now,” he told Rangers TV.
Halliday, like fellow summer signing Waghorn, has been in excellent form for Mark Warburton’s team this season and has proven a key figure in a team where competition for places is intense.
The former Bradford man has made sure he is firmly in Warburton’s first-team plans and has contributed a great deal – even if penalties are off the agenda for the time-being.