I think that MathStudio should handle bookmark. I got worksheet with more than 600 lines and I lost time to reach the line I want to go. Or add in the search button lines with comments and not only entries.
By the way, MathStudio crash often with very long script...May be in some condition the memory is corrupt or so ??? I erase APPs in the multitask to let a maximum of memory to MathStudio but it always crashes.