rating difference last 3 months

In the player tables section we are able to sort coloumns by rating, moves this months and moves total.

A nice possibility would be to able to sort by rating difference last 3 (for instance) months. I mean, just to see who to avoid...

A very steep increase could susp cheating.
A very steep decrease could susp sandbagging.

I like it.

Perhaps have this for Clan challenges too.