Wikipedia says: " It is a slightly viscous, highly polar liquid commonly used as a solvent in a variety of industrial applications such as in extractions, as a reaction medium, and as a cleaning solvent. As an intermediate in organic synthesis, it is used widely in the manufacture of pharmaceuticals, pesticides, explosives, fibers, and coatings." there is the one big problem which s that if it's used as a solvent, storing it will be harder, and also if it's "slightly viscous" the flow rates would drop preventing large amount of it to be burned quickly, so maybe as an upper stage but a first stage engine would require too much of it to store and keep flowing. On the other hand, it requires less oxidizer (can be used as a monop and is already used for rocket/engine applications so storing and pumping must already be figured out. There was a combustion velocity measured at .5 m/x vs lox/lh2 at 2,435 m/s, but I don't think they are measuring the same thing, and carbon monoxide is produced through nitromethane's combustion, which is a poison that can lead to harmful testing at full rocket capacity. Also it's a high explosive, meaning that it's dangerous to transport.