It seems that in 5.0.945, settings for 'Sensitivity' and 'Packer' of Full System Scan&Removable System Scan can no longer be modified. And the default 'Heuristic sensitivity' for quick scan is Low, and Full System Scan 'Medium'. Why is it so? Moreover, it's not calrified in the upgrade log of 5.0.594. There will be guys unaware of the change and scanning their computer to find avast! detect less threats than they expected, won't there? And why does avast! disable these settings?