plus I do not know how to have a selectable crawl option on the DVD

One way to do it is to use the Playlist option of DVDs. The main video file has the whole movie and both crawls, one after the other, this will cut down on the search time when transitioning from the chapter marker points. The playlist is made up of the Chapter Markers, and you skip the crawl which is not being used. (i'm using the terminology from DVD Studio Pro, might be called something else in the programs you are using)

Another option would be multi-angle / alternative angle, heard about it but haven't done it myself.

The playlist option just means there's extra video to be accounted for, the multi-angle might work like having a second audio channel, where it affects the bit-rate of the video encoding, but not sure.