Lowering springs can kill shock absorbers in two ways.
First, you're reducing the suspension travel, so it's easier to reach the bottom of the shock's travel, especially with damaged or non-existant bumpstops. Doing so can easily kill it.
Second, lowering springs generally have a significantly higher spring rate than stock. This means that for a given magnitude of bump, a lowering spring will load and recoil in a much shorter distance and over a shorter period of time than a stock spring. These more violent impacts and rebounds can quickly wear out the shock's valving.
Significant lowering and/or spring rate changes should be accompanied by upgraded shocks. Those .75" drop H&R springs, IMO, aren't really a significant change. The Eibach 1.2/1.0 springs are borderline... You could probably get away with the stock shocks, but upgraded aftermarket shocks would be a good idea. Anything more, I would definately get performance shocks.
The same goes for suspension components. For the sake of your tire's longevity and maintaing low drag, get the toe-in adjusted after any ride height change. Replacement components to allow additional adjustment such as a camber kit is probably unnecessary up to around 2" drop. Stock CRXs have some positive camber from the factory; lowering makes the camber more negative, so you can just think of it as correcting the camber.