I set a lot of vars. I also keep a record of the ones that come as a horrible surprise w/ new acad versions so I can remember how to turn them off.
//ANNOMONITOR and set this variable to -1. to stop yellow alerts next to dims
//COMMANDPREVIEW=0 toggles command preview
//CURSORBADGE=1
//Cullingobj=0 Use 1 to select hidden faces 3d
//DIMTXTRULER=0 TURNS OFF the MtextRULER
//fielddisplay=o No graybackground on fields
//("filetabclose", 0); turns off dwgs/file tab at top
//Hpinherit=1 uses origin from hatch object
//Isaveback-creates a Bak file
//lasso options->selection->Allow press and Drag for lasso
//("LAYLOCKFADECTL",15); //fade for locked layers
//Mirrhatch=1 allows mirroring of hatch
//NEXTFIBERWORLD =0 FOR DEBUGGING
//("QPMODE", 0); turns off quick properties
//Rememberfolders=1 DEFAULT PATH FOR DIALOGUE BOXES IS LAST PATH
//("SUBOBJSELECTIONMODE ",0) to turn off selection dialogue box
//SELECTIONEFFECT and PRESELECTIONEFFECT both to 0 sets the selected objects to appear as dashed
//Solidhist=1 saves history
//Sysmon=0 System variables are not monitored.
//startmode =0 turns off the start tab
//SURFEXTRACTCURVE use to get isolines
//xedit=0 Prevents in-place reference editing
//XREFOVERRIDE to 1 and xref objects will take on Bylayer behavior
// HALF MOON NEXT TO CURSOR
// when geometry is copied and selected to be moved, if you hold down shift the icon appears.
//This is an indicator that the geometry can only be moved orthogonal to its present location.
//if the icon is frustrating you: select some geometry, copy it and when you move it hold down the shift key.
//Move the geometry and then delete it and the "Bug" should go away.
//SELECTIONCYCLING
// 2 OVERELAPPING RECTANGLES NEXT TO CURSOR SET TO 0 OR -2 TO TURN OFF
//FILETABPREVIEW : setting it to 0 prevents showing the 'thumbnails' when passing over the file tabs..
// FILETABTHUMBHOVER: controls what happens next, when you hover one of the thumbnails..
////SELECTIONEFFECT =0 for dashed lines when selecting