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I agree with blu, but here are some precisions.
1. It is usually safe to keep ONE angle ONLY! Many programs, including VobBlanker and FixVTS cannot properly rebuild the angle pointers in the VOBs if you strip some of them but leave several angles in place. If you want lo leave, say, two angles, you can use DVDShrink to compress the unreferenced angles at the maximum compression ratio and remove their audio tracks completely, but afaik, there is currently no easy way to remove them completely without reencoding. Anyway, use VB or FixVTS only if you leave all angles or only one.
2. Remove Useless Stuff is a collection of safe functions that you can use independently also, grouped together to quickly simplify the DVD. In some rare cases, a function can be unsafe, but in that case, you will be prompted to continue anyway, or abort that particular function.
BTW, I am currently working on new functions that will be added to Remove Useless Stuff in PgcEdit v9.3.
3. The Delete Stream function in DSA has been added so that you can rearrange the streams left over after having stripped them, for example with DVDShrink with the option to remap the streams off. However, as blu explained, it cannot be used to remove the stream from the VOB. (Unfortunately, if you have removed the stream references with PgcEdit, you have no way to tell DVDShrink to strip it from the VOBs as it not visible in its GUI any more. To remove a stream and regain its disc space, you should always use Shrink before PgcEdit. Same thing for VobBlanker.)
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