this worked some time ago.
Current minimal mkiv
\def\tabulateuse#1{%
\dorecurse{\numexpr2*#1-1\relax}
{\span\omit}}
\appendtoks
\let\use\tabulateuse
\defineTABLEshorthands
\to \everytabulate
\starttext
\starttabulate[|l|Bc|c|c|c|r|]
\NC a\NC b\NC c \NC d\NC e\NC f\NC\NR
\NC a\NC \use2 b\NC d\NC e\NC f\NC\NR
\NC a\NC \use3 b \NC e\NC f\NC\NR
\NC \use4 a \NC e\NC f\NC\NR
\stoptabulate
\stoptext
system > tex > error on line 10 in file 09-02-30.ctxcrop:
Undefined control sequence ...
1 \def\tabulateuse#1{%
2 \dorecurse{\numexpr2*#1-1\relax}
3 {\span\omit}}
4 \appendtoks
5 \let\use\tabulateuse
6 \defineTABLEshorthands
7 \to \everytabulate
8 \starttext
9 \starttabulate[|l|Bc|c|c|c|r|]
10 >> \NC a\NC b\NC c \NC d\NC e\NC f\NC\NR
11 \NC a\NC \use2 b\NC d\NC e\NC f\NC\NR
12 \NC a\NC \use3 b \NC e\NC f\NC\NR
13 \NC \use4 a \NC e\NC f\NC\NR
14 \stoptabulate
15 \stoptext
Herbert
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