To enable selection of any time value when inserting or editing Time Entries you will have to add the highlighted text for the 4 lines starting with:

<vmep:timepicker in the file (Installation folder)\ WebSite\TimeEntry\TimeEntry.aspx .

<vmep:timepicker runat="server" ID="timeStartEditBox" Value='<%# Bind("ActualStartTime") %>' OnTimeChanged="StartDateTimeChanged" AutoPostBack="true" AllowCustomText="true"/>’