The moment of controversy involving goalkeeper Devine came four minutes after the interval with the Tyrone custodian looking certain to have carried a miss-hit free from Aaron Kernan over his own goal-line.
McFadden's 68th-minute free doubled Donegal's lead although the Ulster county had a scare seconds later when goalkeeper Boyle almost dropped a high ball over his own goal-line before Eamon McGee averted the danger.
Bent's persistence created a chance but Green made a decent block at his near post and then Cole hacked away from his ownline when James Collins headed towards goal.
Boyd headed on a Smith cross into the six-yard box, Maros Klimpl, back in the Well defence following suspension, could only prod it towards his owngoal and Velicka forced the ball over the line.
"We were prepared to play rugby from a fair way out from the goalline and were prepared to attack from our own half and that resulted in a couple of tries, " said New Zealand coach Graham Henry.
Meanwhile, Forbes had been restored to the Motherwell starting line-up along with John Sutton after club captain Stephen Craigan paid for his owngoal in their loss to St Mirren by being dropped along with Jamie Murphy.