I should think not, at least in container gardening, that it's advantageous to have a mat of rotting matter as the bottom layer of your plant's soil, but I have nothing scientific to back that up with.

I also think it would not be of any benefit. The bacteria needed to break it down would not be as prominent as in your yard, and that layer of dead grass will probably get pretty nasty down there. I would guess that you'd end up with some stink issues, and probably mold as well. I know someone who uses grass clippings as mulch, and let me tell ya, his yard smells like a farm, and the clippings form a compacted mat of rot, and in the shady areas, you can find fungus and mold.

Joe

.... aerobic fungi and bacteria - methane/CO2/sulfurous gasses - ammonium toxicity - high soil temps due to the rapid composting process - are all significant potential issues - not to mention the negative impact on media structure.

Al