Just from scanning I would say that a dot at the beginning of a line give a more clear sight while scanning the left ruler of a block of text since the left side is "fixed" and the right side not. On the right side your eyes have more trouble finding the dots.
Let a friend take a stopwatch....
Shout "Start!":
add_settings_section(
Config::GetPluginSlug() .
Config::GetModuleMenuSlug($this->_module_id) . '_menu_section_main',
Config::GetModuleSectionHeaderTitle($this->_module_id),
array($this,'SectionHeader'),
Config::GetPluginSlug() .
Config::GetModuleMenuSlug($this->_module_id) . '_page'
);
Shout "Stop!" (...write down how many dots you saw...)
Shout "Start!"
add_settings_section(
Config::GetPluginSlug()
. Config::GetModuleMenuSlug($this->_module_id) . '_menu_section_main',
Config::GetModuleSectionHeaderTitle($this->_module_id),
array($this,'SectionHeader'),
Config::GetPluginSlug()
. Config::GetModuleMenuSlug($this->_module_id) . '_page'
);
Shout "Stop!" (...write down how many dots you saw...)
Now you have the scientifically tested answer :) (well not really... let a test group do the same test on the pieces of text reversed since you were already trained by reading the first part before the second).