I also tried to look for that in the documentation and I really don't think it does.
Right now, I think you have to somehow do the blending yourself, by layering 2 samples and reducing their volume where they overlap. Do it in several steps if you feel the need to...
Anyway, it's a bit tricky to achieve because you have to make sure your samples are properly aligned in phase or you will get un-natural results.
About the tempo connection with the DAW, I think it works by default - at least with some features.
If you try the "Stella Mandolin" instrument available for free at decent samples there is a tremelo mode triggering a note sequence which properly updates with the tempo.
I did not try that with the built-in delay though as I prefer to do this kind of effect with my DAW.