For you information, this information has compiled while BKChem version 0.12.0_pre3 was latest. It lists general workflow tips.
Some tips and tricks are listed at the “Tips and tricks” section of the FNA/FAQ page. However, the following tips were extracted out of progress.log and only new tips are displayed.
Marks
marks on selected atoms can be moved via arrow keys in mark mode. Select the atom, change to mark mode, use arrow keys to move the marks
marks can be moved by mouse while in mark mode with LMB-dragging
numbering support for atoms (use context menu or numbering mode). Number is represented by a mark - it can be positioned in mark mode either by mouse or arrow keys
circle around some marks (plus and minus signs) can be switched off while in mark mode RMB-click on the mark, select “Circle around mark”
set different mark sizes for different marks on the same atom with RMB-click on the mark, select “Mark size”, you have to be in mark mode, of course
Drawing
interactive positioning in draw mode of second line in double bonds is possible with shift-LMB-click
“C-d n” where “n” is number in range 2-9 appends an aliphatic chain to the focused atom. Note, you have to hover the mouse cursor over the atom, otherwise this shortcut is rendered useless.
Other
double click in edit mode selects the whole molecule
“\n” in text entry is translated to new-line
when editing text or atom it is possible to use keyboard shortcuts to insert formating tags (Ctrl-s = sub = subscript, Ctrl-S = sup = superscript, Ctrl-i = i = italic, Ctrl-b = b = bold)