Plus, if you highlight a vertex point that's sort of in the middle of the mesh that you're wanting to eventually select, and use the "Grow Selection" tab to increase the number of points to quickly get you 'sort of close', you can then continue from there selecting individual points to get the rest exact. I just tried it now and discovered (as animagic suggested), you can just continuously hold down the CTRL key and every little 'rectangle-drag-over' of an individual point (or points) you do, will toggle its state (unselected become selected, selected become unselected), with each drag-pass. This 'combo' of Grow-Selection followed by CTRL-Select may be a go .....
lol .... and I just discovered you can even have 2 or more of these combos happening at the same time. Just add-in a second isolated point (or points) (while CTRL is still kept on), and both regions can now be 'grown' or have points added (rectangle selected) as you proceed - LOL.
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Please be patient with me ..... I don't always 'get it' the first time 'round - not even the 2nd time! :( - yikes! ...
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