You should definitely monitor the amount of fluid that is leaking. I would not recommend driving the car for any long duration.
I had a hairline crack on the Honda Prelude's radiator awhile back. Instead of purchasing a new one, my shop welded the crack shut which solved the problem. I know the dealer will not weld it so you will have to go to an independent shop.
'00 E430 w/ Solaris H-7's
Brabus 19'' Monoblock V, 2 piece
H&R Sport Springs
'99 SLK230 Sport