Yes - the reason for using left/right instead of top is that if there is a link which has accesshide and becomes visible when you tab to it, then when you do tab to it, sometimes the browser scrolls up to the top of the page which is obviously really unhelpful. This doesn't happen with left/right.
Also if we are trying not to use 'top' value less than about -30,000 to avoid this crash, then a very very long page might get messed up.
I have just checked it and can confirm the bug in Chrome RTL. It works correctly in Firefox. However there is also a similar bug in IE7 and IE8 RTL (although in this case it's just frankly wrong as the scroll is to wrong side, and it doesn't reveal the hidden text like it does in Chrome...)
Maybe in this case it would be preferable to take the slight accessibility hit, in RTL languages only, and use the top: -30000 or whatever (hopefully avoiding crash).