Independant timeline for instanced and linked collections

When a collection is linked or instanced, its animations are synchronized to the main scene timeline.

It would be really useful to be able to have an independent time for each instance, with some parameters :

• Start/end frame : to only play a portion of the original collection animation
• Time offset : to offset the sequence from the begining of the main timeline
• Time scale : to accelerate or slow down the animation sequence
• Pre/Post repetition behavior (reset, keep last keyframe, loop or mirror + loop count + falloff) : to allow looping animations

OR

A simpler version would be to just add a "frame" or "time" parameter to the collections, which could be animated with the existing tools, like any other value. This way we could navigate at will inside the animation of the linked / instanced collections, independently of the main scene timing.