I agree, this is definitely a bug. In fact I spotted it in the public beta but it made drawing so unusable that I just assumed that drawing was completely broken in that build (which I assumed would be fixed!), and didn't bother to test further.
I can't believe it made it to the final product! Try writing a few words in ink and try and select them with ctrl+click or the selection pane, you'll be there all day!
Reporting it: my workaround is better than nothing, but this still needs to be fixed (hopefully in SP1), so we need to make sure it's reported. I think the official way to report it is to tell tech support, as if you had a genuine question. After much back-and-forth
you should be able to convince them that it is actually a bug, and after being escalated several times it should eventually reach programming. I suggest everyone having this problem do that until we are assured a programmer has heard about it.
My workaround: In previous versions of Word when you started to draw, a box would appear in your document saying "create your drawing here" or something, called a drawing canvas. Canvases are no longer created automatically by default in Word 2010, but
this can be changed in options: go to the advanced page, and it's the fifth checkbox down (under editing options, the first section). The key point is, lasso selectiondoes work in drawing canvases, even in Word 2010.
Variation of the workaround: If you don't like canvases being autocreated (e.g. it probably won't help with inking) you can add a button to the ribbon or quick access toolbar to create one manually. I'll assume you know how to customise the ribbon, and just
tell you which command you're looking for: it's simply called "insert drawing", and you can find it "commands not in the ribbon" list. In the keyboard shortcuts dialog it is the "InsertDrawing" command.
Hope this helps.