SKTimeStamp: change simultaneously Created, Last Modified and Last Accessed [enhancement]

[tvbrogreat]

Thanks for an immensely useful tool!

For file syncing, it would be great if there could be a way to set date and time for all three fields Created, Last Modified and Last Accessed at once.

Maybe a fourth date/time field below Last Accessed and a button next to it: "Apply to all the above".

Again many thanks for the effort on these tools.