It's no secret that Illustrator's path/point/handle selection interface is just about the most cumbersome of all. In fact, only the most devoted Illustrator-only users deny it. These scripts are mere workarounds for some of the awkward selection chores; but they do make life a little easier in a few common situations.
For example, most programs offer the user the choice of whether marquee selection is "contact sensitive." Illustrator doesn't. Its selection marquees always select everything they touch, not just what they surround. In some situations that's what you want. In others, it's not. The Marquee Deselect Partials and Marquee Select Rest scripts don't really fix that; but they do provide a reasonable workaround by modifying the selection after-the-fact.
To Use: Select one 2-point path. Run the script. The script searches for other 2-point paths which are the same length, and adds them to the current selection. The selected paths can then be either deleted or joined by the JET_Join Nearest script.
To Use: Make a marquee or lasso selection which completely surrounds the paths desired for selection. Then run the script. Additional paths which were only partially selected become deselected.
To Use: Make a marquee or lasso selection which surrounds, touches, or crosses the paths desired for selection. Then run the script. All paths which were at least partially selected become completely selected.