Adjust rendering of BibTeX entries

["Dr. Thomas Möbius" <moebius@medinfo.uni-kiel.de>]

Dear list,

I would like to render BibTeX-entries with the provided
APA-style, however, in the text use superscript cross references.  I
have the following issues, which I don't know how to resolve. I was
hoping, you could help me.

1. When choosing the style APA, the change to \setupcite seems to be
    ignored, see the minimal example below. (When changing
    alternative=apa back to alternative=ams, it works again.)

2. As I am citing bibliography entries with numbers, adding letters to
    the end of the publication years makes no sense.  How can I
    loose the letters? Now, also the provided AMS-style adds these
    letters, which I don't think should be the case, too.

3. The edition field when citing a book is rendered wrong. It should be
    7th edition followed by a period. (Compare this with the ams-style,
    where the edition field is rendered correctly.) How can I add the
    period and automatically add the st, nd, rd, th to a edition number?

4. Say, I would revert back to AMS-style but using superscripts rather
    than the [#Number] default.  How can I loose the square brackets in
    the reference section?

Thank you very much in advance.

Thomas


----example.tex----
\setupbibtex[database={references},sort=author]
\setuppublications[alternative=apa,sorttype=authoryear,numbering=yes]

\setupcite[num][
     left=\raisebox{1ex}\hbox\bgroup\tfxx,
     right=\egroup,
     lastpubsep={, }]

\starttext
\title{Test with APA}

\section{Some text}
This\cite[Mustermann:2014, Doe:2012a] and that,\cite[Doe:2012b] also
that\cite[Doe:2012a] and this book.\cite[Mustermann:2001]

\section{References}
\placepublications [criterium=text]
\stoptext

----example.bib----
@article{Mustermann:2014,
title   = {One hell of a title},
author  = {Max {Mustermann}},
journal = {SomeJournal},
year    = 2014,
volume  = 63,
number  = 2,
pages   = {289-298}
}

@article{Doe:2012b,
title   = {Another title},
author  = {John {Doe}},
journal = {SomeJournal},
year    = 2012,
volume  = 3,
number  = 2,
pages   = {189-198},
}

@article{Doe:2012a,
title   = {Foo Bar Zap},
author  = {John {Doe}},
journal = {SomeJournal},
year    = 2012,
volume  = 4,
number  = 1,
pages   = {89-92},
}

@book{Mustermann:2001,
title     = {How does this work?},
author    = {Max {Mustermann}},
publisher = {Springer},
year      = {2014},
edition   = 7,
address   = {Berlin/Heidelberg}
}
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