. . . . Is there a way to set the mouse scroll wheel to move between photos? and then use ctrl+scroolwheel to zoom? . . . .
Not within the program - however by default the left/right arrows scroll through images.
If your mouse has programmable buttons it may be possible to reprogram the mouse wheel to mimic the left/right arrows - however this usually means that it will affect all programs.
If you have a Shuttle device the jog wheel and dial can be reprogrammed to do what you want and affect only Photo Manager.
thanks for your reply. If you have any way to suggest this as an option, it would really be useful. I'm coming from other photo manager apps and it is a reasonably common feature. Especially for right-handed mouse users. arrow keys are too far on the right side of the keyboard... just a setting to allow re-mapping of keys.