My daughter is a US citizen. She is also an Indonesian citizen (as is my wife - though my wife is a US LPR). So when we travel to Indonesia and then Australia, we would like to use our daughter's Indonesian passport for her entry into Indonesia (thereby no need for Indonesian visa); when we go from CGK to SYD, we would like to use her US passport (thereby no need for Aussie visa). And of course, we will use her US passport when returning to US.

Any drawbacks to this approach? Btw, my daughter is all of 2 yrs old - no security risk unless a soiled diaper is considered a WMD.