1) You can resize windows by holding ctrl
2) you can quickdraw pointers/boxes/circles/cones by using LM+RM and holding shift/ctrl/alt or nothing
3) You can issue move orders as the DM with middle click + drag, and approve move orders with a simple middle click
4) Holding ctrl to target enemies not only shows the range, but makes using abilities and macros easier and is required for multi-target spells
5) You can resize tokens with shift+mousewheel while moused over them as the DM
6) You can change the target of effects after they've already been applied from the CT (Combat Tracker)
7) You can do a manual critical hit by holding shift when rolling
8) You can auto-assign XP by loading the monsters into an encounter, then loading the encounter onto the party window
9) You can set the lighting to any hex code
10) You can make characters offline, then export them to a local folder. Then when you join a game you can import your pre-made character
11) As a DM, you can clear the mask (fog of war) by either clicking and dragong for a box tool, or holding shift for a free-form tool
12) the "Target Mode" on the map gives you a box selection tool for selecting multiple enemies at once (like in an RTS when you click + drag to target)
13) You can pre-load where monsters/npc's are placed in a pre-built encounter by dragging their token on a specific map. You can also create links on the map to automatically open an encounter
the resizing trick lets you click anywhere on a window to resize it, so no more trying to snag the corner of it