On the Sony Cyber-shot point-and-shoot models discussed here, there is generally no direct manual control over shutter speed or aperture. One community answer specifically notes that the DSC-W80, a 7.2MP Cyber-shot model, does not offer manual exposure-length adjustment, so lower-end 7.2MP Cyber-shot models are likely similarly limited.

That means for lightning photography you’d probably have to rely on the camera’s automatic or scene modes, such as Night mode, rather than setting a long exposure yourself. If your exact model lacks manual exposure controls in the manual or menus, then yes—you are limited by the camera’s design.