I would suggest BD-RB as an alternative to having a Bluray split into multiple DVDs (possibly 5 DL or 10 SL?) in Bluray structure. BD-RB takes either the full Bluray or only the movie of that Bluray, and reencodes it into a single BD-9 (Double layer DVD media, but in Bluray structure) or if you'd like, even to a BD-5 (single layer DVD) .... I'd recommend the BD-9
Looks incredible!! I just watched Bangkok Dangerous and could not distinguish any differences from the original Bluray and the BD-9 copy of the movie only. Played thru my Sony Bluray player and viewed on my 42" HDTV...in full blown 1080p!!
BD-RB thread @ Doom9
BTW, you'd burn the same way with IMGBurn... also, just FYI, BD-RB does take a very long time, but that's becuase it is reencoding with x264 for superb quality retention.