Any chance of getting a 'sync' toggle for the image sequences?

Currently sequences are hard synced with frame changes on the timeline, AFAIK. You can get the sequence offset but you cant time remap it or create holds etc. If there would be a ‘sync’ toggle the animatable ‘offset’ value could be used for time remapping an image sequence or a video file.

Also image sequence nodes don’t have any inputs for controlling the any of the values, it would be great to have the offset available so I can modify it without duplicating the node.