Customize the header in presentations

Design Request-
"Hello it would be great to be able to customise the header in presentations ( positioning, colour etc) basically to be able to create your own template that is not over ridded by an automatic one.
Currently, you can add templates but once you export to pdf your template is put into an automatic template ( grey line on the top and your company info above). This makes the page look weird - double logo..
Also it is difficult to add (for example) technical drawings made with other programs in other templates. The pre presentations for the same project are not in line…Thank you!"