Sometimes I want to preserve menus but I don't care about the quality of this menus and I can compress to gain more space for main film. This feature will be great in Clone DVD.

Other thing I need is a Audio and Subtitle Preview in Video Preview window (or in other place). Some videos have more than one audio/subtitle track in the same language (main audio/subtitle and director's comment for example) and I don't know which track is the main. Recode2 have a feature to choose the audio for preview with rigth button in preview window. This will be great.

everything you've mentioned has been addressed numerous times in this forum

do a quick search and you should find all of the reasons why such things are not, were not, already are, may be, may not be, and will be implemented in the future.