Morph Manager probably is the best tool for the particular job, but I thought it might be worth mentioning some other tools that I find helpful when working with Poser library files.

There are two free Poser library file editors that I know of "CR2 Editor" and "CR2Builder". These are similar to Morph Manager in a lot of ways, but also let you work on other parts of the file besides the morphs. There is also the commercial product "Poser File Editor", I have not used it myself, but people speak highly of it.

Then there is svdl's "SpawnCharacterP6 update" py script. This script is handy if you have a number of different morphs applied to a figure. It consolidates any morphs applied to the figure into one morph for each actor, and creates INJ/REM files for that morph. Quick and simple to use, but only works for figures that have the DAZ style PBMCC channels. Another way to make delta injection files is with "Pozers Little Helper", it is not limited to using PBMCC channels, but has a bit of a learning curve. These apps package and inject deltas, so you should keep in mind copyright restrictions. "Spawn FBM" is handy utility when making custom FBM's.

There are also some utilities that whilst not specific to Poser, are very useful. "FileBox Extender" takes a lot of the hard work out of navigating the Poser Runtime structure. "Code Keeper" is handy for storing snippets of Poser code.

Quote - I can't just use the sidebar to quickly move down, because it unhighlights the start of the morph and I can't shift-click at the end. >_<

In Windows you can Select the first line of code, then hold down the Shift key, and tap either the Down Arrow to extend the selection one line at a time, or Page Down to extent the selection by one screen length at a time. Use the Left/Right arrow keys to make fine adjustments to the end of your selection (holding down the Shift key all the time).