30 May
2016
30 May
'16
9:27 a.m.
Are you using Gnome? If so, then in Gnome Tweak Tool, under "Keyboard and Mouse", there's an option called "show location of pointer". If you turn that on, then every time you press the control key, the mouse pointer is highlighted by moving circles.
Unfortunately that isn't very visible, also I'd prefer something that is permanently visible.