[Tex/LaTex] Modify the last-name first-name separator in biblatex’s authortitle

biblatexpunctuation

Using the example below, how could I modify the separator between last name and the initial? Currently this is a comma e.g. Fox, P. and it should be just a space: Fox P.

And a similar problem: How could I remove the period behind the initial?

\RequirePackage{filecontents}
\begin{filecontents}{sample.bib}
@ARTICLE{liu:11,
  author = {Peter Fox and Richard Rabbit and Franc Bird},
  title = {Animals are the better humans},
  journal = {Horse and Hound},
  year = {2011},
  volume = {10},
  pages = {11--15}
}
\end{filecontents}

\documentclass[a4paper,ngerman]{scrartcl}
\usepackage{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{csquotes}
\usepackage[style=authortitle,firstinits=true]{biblatex}

\bibliography{sample}
\begin{document}
Samplecite~\cite{liu:11}.

\printbibliography
\end{document}

Current status
alt text

Best Answer

put it right after loading the package biblatex. If I understand it right, then you only want to strip the dot from the first initial. 

\makeatletter
\def\MKbibnamefirst#1{\expandafter\mkbibnamefirst@i#1..\@nil}
\def\mkbibnamefirst@i#1.#2.#3\@nil{#1}

\renewbibmacro*{name:last-first}[4]{%
  \ifuseprefix
    {\usebibmacro{name:delim}{#3#1}%
     \usebibmacro{name:hook}{#3#1}%
     \ifblank{#3}{}{%
       \ifcapital
         {\mkbibnameprefix{\MakeCapital{#3}}\isdot}
     {\mkbibnameprefix{#3}}%
       \ifpunctmark{'}{}{\addhighpenspace}}%
     \mkbibnamelast{#1}\isdot
     \ifblank{#4}{}{\addlowpenspace\mkbibnameaffix{#4}\isdot}%
     \ifblank{#2}{}{\addlowpenspace\mkbibnamefirst{#2}}}
    {\usebibmacro{name:delim}{#1}%
     \usebibmacro{name:hook}{#1}%
     \mkbibnamelast{#1}\isdot
     \ifblank{#4}{}{\addlowpenspace\mkbibnameaffix{#4}\isdot}%
%     \ifblank{#2#3}{}{\addcomma}%
     \ifblank{#2}{}{\addlowpenspace\MKbibnamefirst{#2}}%
%     \ifblank{#3}{}{\addlowpenspace\mkbibnameprefix{#3}\isdot}
}}
\makeatother

alt text

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