What are com.sonyericsson.usbux and com.sonyericsson.capabilities? This list tells me that I should not remove them, but what do they do?
According to this post, com.sonyericsson.usbux is enhancedusbux.apk app, which handles USB support.

com.sonyericsson.capabilities belongs to DefaultCapabilities.apk app, but I haven't been able to find anything about its functionality, other than a cryptic "hardware capabilities" description.