Provided by Chris Chokan on the DieHard Wolfers Forums.

Controls | Effect |
Arrows | Move around map |
Ctrl+Arrows | Move a screen at a time in any direction |
RShift+Arrows | Move a tile at a time in any direction |
1 | Toggle Background plane drawing on/off |
2 | Toggle Foreground plane drawing |
4 | Toggle Background plane display on/off |
5 | Toggle Foreground plane display |
Spacebar | Go to tile selection window |
C | Copy a block: left click in upper left corner, right click in lower right. Enter to copy it into buffer. Esc to stop process. |
P | Paste from copy buffer wherever mouse is |
B | Draw a block of the current selected tiles into current selected planes. |
F | Flood-fill one plane's tiles with currently selected tile. |
U | Undo last action. This is occasionally erratic. Be careful! |