Capability to move through Priors within Viewport with a shortcut key for other modalities

Capability to move through Priors within Viewport with a shortcut key for other modalities (Similar to how Breast Imaging can move through Priors). Since there can only be two priors loaded automatically into an HP. MSK would like to have to capability to have more than two priors automatically load into HP, but also it will be good to have the capability to move through them without having to go to the Navigator or Series Selector.