Maped:
'M' shows full map
'O' goes to 'obstriction' mode
'1'/'2' switch between background and foreground layers
in the 'tile selector mode' Zara mentioned left clicking on a tile puts it into the left click slot, right clicking put it into the right click slot
'a'/'z' make the left click selected tile increment/decrement by 1
's'/'x' make the right click selected tile increment/decrement by 1
also in the tile selector mode click 'p' to turn off padding and the above controls make a lot more sense