Do you have a favorite RBN1 era song that you want to play in RB3 with keys and harmonies?
Harmonix has no control over this whatsoever - it's entirely up to the authors. However, this thread is a good place to let the authors know what songs you want to see upgraded.
(Also, PS3 players: this is a good place to list RBN1 songs that were never ported, since they would need a new version in order to be eligible for porting. However, being updated for RB3 is no guarantee that a song will be ported to PS3, as there are a number of factors at work here.)