Sometimes there's not enough space on trackpad to continue highlighting text, if highlighting is active, using second finger to continue cursor movement would be cool. PS there's no trackpad section PSS removing kcm prefix could allow to filter the list of components in bugzilla.
There is an option to do tap and drag lock. In this mode, you can tap once to start selection mode. Then within a timeout, you can continually tap and slide your finger to continue selecting. When you are done making your selection, you can lift your finger and wait for the timeout (approximately 1 second). Is this feature you were looking for?
Assuming yes due to lack of response. :)