I can do it, but I've no idea how I'm doin' it. It just happened one day when I was playin' Marth. Tried t' replicate what I thought was a glitch, and I learned t' mash all the buttons on the right side'a my controller to Glide Toss. I didn't actually know I was Glide Tossin' for... at least a year IIRC. Didn't find it important since I never played characters that can nab items, nor did I often face anyone who used said item-abusin' characters.