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I mean, yes? It can be used in any ROM for that matter.
For example, try this (this will put black bars on the bottom and top, like a movie trailer):
writebytetooffset 0x80 0x4000044
writebytetooffset 0x20 0x4000045
To clear it:
writebytetooffset 0xff 0x4000044
writebytetooffset 0x0 0x4000045