[VTT Suggestion] Fog of War Mouse Axis Lock

 I dont know if i am missing something as i really enjoyed the VTT.  I had to stop using them after i would be pain stakingly erasing my fog of war and to nudge the mouse to reveal something i did want to.  This was affecting the flow of my game (still not as much as my grid paper haha).  I ended up switch to another platform because of this.  I relize asking for POV  fog is an endevour to code.  I would enjoy just a simple like axis lock, or ortho lock so that i could erase the fog in straight lines.  Just holding another key would lock it horizontal or vertical.  I dont see many posts about this so maybe i am totally missing something here, cus it brings me back to the 90's trying to draw with MS paint.