When working with terrain builder previewing your terrain and objects, buldozer uses cursor which can be changed as its simply a P3D model.
Replace the Cursor.p3d in P:\core\Cursor with any model you like.
My main pet peeve has been precision of placing objects and selecting them within buldozer. Well here is my cure. I've made a few high precision cursor models that will let you place and manipulate the smallest of objects, Runway lights and similar.
There are currently 3 different ones but more will be added. Personally I only use the small one depicted here.
Back up your:
Pick one of the cursors in the downloaded archive, rename it to cursor.p3d and replace the original.
Source bis forum topic. Download bludclot_cursors.7z 3kb.