I use a 2.6.1 kernel now. to do my writing, i use cdrtools 2.something package, probably the latest, with the latest xcdroast with gtk2 support enabled. xcdroast did give me warnings that ide-cd would be slow and i should enable scsi emulation and etc etc.. but i didn't, and no.. i didn't face any delays at all. i have a two year old sony 24x10x48 ATAPI cd-rewriter with burn-proof support. the idea is, if ur using a 2.6.1 kernel and want to burn cds, you dont need scsi emulation. so i dont use those "hdc=ide-scsi" options anymore, neither do I have them compiled in my kernel. I don't have any scsi hardware as well.
hope that helps.