@petri999 A grandmaster starting at 1200 will draw some rating from the pool, maybe not much because of the high RD but some. Likewise a beginner starting at 1500 will leave some rating to the pool.
Before like the year 2000 FIDE rating was only given above 2200 for men and 2000 for women. The national federations then regularly took action to adjust their national rating system such that their FIDE rated players got about the same national rating as their FIDE rating and all their other players got corrected up or down accordingly.
I appreciate the problems @Toadofsky hints about. If we were to ask a new member about his/her FIDE rating, they could supply false information. If we would ask for verification, we could infringe on their privacy and right to remain anonymous.
Another way would be to only give a rating after a certain number of games, e.g. after 10 or 20 games. This would leave new members without rating for some time. It would also present rated members with a rating correction later when the new member got his rating for games played earlier.
RD is effect not giving rating before certain amount of games.
Biggest problem in keeping sync with FIDE would be that since time limits are shorter the difference between best and worst players is smaller. Hence it would be possible to keep only one point calibrated and I dunno what would be the point of that. No online ever is one to one predictor of OTB rating
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