I would like to have a sequence of chapters such that each one repeats (loops) until either the Next or Menu keys are pressed. I know that this is possible with DVD's but do not know how to set this up with DVD Architect.
Looking back at the original question I personally think George's solution using a cell command to loop is probably the simplest, & perhaps the best, though there are alternatives based solely in DVDA.
The original post mentioned the "Menu" button, which while probably the easiest of all to execute, might be a poor choice -- how does the viewer reach the menu? Yet in some applications maybe that's not a bad thing? To use the "Menu" button to switch video, simply set the menu button properties for that video. It means using separate titles -- you can do this by using separate videos, or by setting multiple buttons linking to the same video with different start and end times.
And although the original post asked about the "Menu" & "Next" buttons, maybe the most intuitive to the viewer would be "Enter"? A simple BOV could be added, with or without graphics, that would link to either a dummy menu page [storing a script] or the target video including the target chapter.
Adding scripting would likely be overkill when the goal is simply jumping to another video [or place in the video], but I just wanted to mention the possibility... You might for example tailor the target video depending on some GPRM value, or maybe use the dummy menu page to set a GPRM value before resuming video play -- that value could then do things like turn looping on or off for all your video segments.