He was thrown into the action after an hour with Rangers leading from a first-minute Kris Boyd strike, and promptly set up Carlos Cuellar for the killer goal in the 2-0 win before rattling the crossbar himself.
Darcheville - quickly earning himself a reputation as a fans' favourite - now looks set to be given the nod for the lone striker role ahead of fellow substitute Daniel Cousin when Rangers take on Barcelona in the Champions League on Wednesday night.
"I don't think we have been fortunate enough to have him fully fit all this season but he has made an impact in every game he has played in," said Smith.
"Hopefully we can have him injury-free for the rest of the season. He gives us something a little bit different.
"He has good game knowledge and he can bring the best out in a number of our players so I'm certainly hopeful that will be the end of his injury problems and we will have him injury-free until the end of the season."