ive done it for fun, heres what i did: i used a cloth pot then folded the top of the cloth pot down over the dirt so if i laid the plant on its side it wouldent fall out. then over time, maybe a month or 2, i trained the plant to grow in funny ways by having the plant on its side, upside down, really every random way and since my light was always above it hanging down, my plant looked like a baseball on a stick. it was a fun game to make it look like that but it wasent like.. a productive choice.
as far as getting root bound goes, theres no such thing really as getting root bound assuming you have the right tools. products like hygrozyme change the way that all works. i agree totally tho that marijuana likes rootspace and for a fast growing plant more water is needed then havinging a small container allows