+1
I've run into the need for something like this several times while customizing on-the-air and fixed 'set' playlists. And the need is ongoing.
But one issue with doing this has to do with whatever xfade or gapped/fade mode you have globally set for tracks in that playlist. If there was a link say, to two consecutive tracks of an album, I'd think you want them NOT to be subject to your default transition method, but play them as they are natively? In the case of two tracks of an album, they would run together anyway (usually) so they'd need to butt up to each other (gapped, no xfade). But if the linked tracks are such because of a personal preference of some sort, and don't necessarily relate to the same album or even same artist, you may or may not want them to ignore your global transition setting.
So would a toggle option to ignore global transition setting be defined just for that linkage, or would it become more than that where you'd need to define an entirely different transition type just for the linked files (multi-choice, just like in the global defs), separately of your global definition? If the latter it may make the feature much more difficult to implement.
Just saying.