I am using OpenOffice on a Tatung Tablet PC.  I use it mostly in slate mode 
where the primary input method is via a pen based interface that offers left 
and right click functionality.

I use the Text document processor to add notes and use the drawing toolbar to 
annotate and take quick sketches.  The problem is that there is no way to drag 
and select all the objects you drew in-order to group them.  Currently the 
only way to group drawing objects is to use the SHIFT key and then left click 
to drag a selection tool over the objects to select them all.  Then you can 
group them.

The problem is, with a pen only, there is no way to press the shift key and so 
there is no way to group objects.  This is difficult because a quick sketch of 
a graph figure has potentially dozens of small lines and numbers that need to 
be grouped before you can drag the figure to a new location on your sheet.

Possible solution is to add a optional button on the drawing tool bar to serve 
as a "shift key" that when pressed will allow the next "left click" to be read 
as a "shift-left click".