In cases when a 4-layer board is space limited, and there's a lot signal traces in the whole board, "power plane layers" is not very usefull to distribute power rails. Because it is used only to draw solid regions in a negative format. Therefore it is very hard to place some signal traces along the power plane.
I've been thinking, what's the difference to use a "signal-layer" instead of "power plane layer" which offer the capability of non negative format? You can also draw as solid region as you want but you are still able to put a few traces that they are difficult to stand on the external layers due to complexity.
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