If you dont use the mouse you can just enable the mouse dot.
I know the mouse widget "dot" (which is always just in the middle) - the thing I'm talking about is different. You can see it in use in the following video where I've marked a direction I want to head in across the canyon I'm trying to cross. See the blue targetting reticle fixed up in the sky there?
[video=youtube_share;HUNp4KQcI-k]https://youtu.be/HUNp4KQcI-k[/video]