It means we get the right as shareholders to throw more money...

It means we get the right as shareholders to throw more money into the moneypit if we so choose.
First they need to raise urgent capital or go bust. They've had months in suspension to sort this out, but leave it to the last minute, which will almost certainly see any money raised to be at giveaway prices.
The catch is, if you choose not to participate in any spp, (should management save the company from the perilous state it is currently in, which of course they alone have created) you will be heavily diluted and suffer further erosion of the sp. A bit of a double whammy.