We are aware of these issues. The problem is that there is a certain regular expression that verifies the entered title for the frontend pages, but this regular expression cannot be changed in the configuration. There is a PITS issue for that -
Generally you should be able to include any characters that you wish to be "valid" simply by extending the default regular expression for titles which is
by adding additional escape sequences like \: \| etc., but because of this bug/PITS they are not taken into effect. Apologies for the inconvenience.