Without a read/write user folder, running SD! is really not going to work from the DVD, specific kexts or not. Certainly, users who aren't terribly sophisticated shouldn't try this.
The file system in Leopard is significantly different than Tiger's, has much more metadata included, etc. While copying from Leopard might work, it also might generate structures, EAs, etc that could cause issues: remember we're copying file-by-file, with system calls, and those calls will be Leopard calls, not Tiger. It's a generally bad idea.
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--Dave Nanian
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