As you can see in
OTC sources in
game.cpp
EnchancedAnimations that
contains time between each frames is enabled in client version
above 10.50
C++:
if(version >= 1050) {
enableFeature(Otc::GameEnchancedAnimations);
}
Also,
GameIdleAnimations that
contains frame-groups (Idle/Stand and Move) are enabled in version
above 10.57
C++:
if(version >= 1057) {
enableFeature(Otc::GameIdleAnimations);
}
So my answer is: It's not possible to add this feature in 8.60 client.
Have a nice day!