I can't speak to future plans, but you can definitely "roll your own" by recompiling the pdksh.  I recently built the 
more modern mksh (which includes both vi and emacs editing) without any major difficulties.

________________________________________
From: Jaroslav Rab [community-noreply@qnx.com]
Sent: January-28-12 4:39 AM
To: general-toolchain
Subject: pdksh (aka ksh in QNX) vi-like control

I realized,
the included ksh shell is actually pdksh, but compiled with the --disable-vi option. I'm a big fun of vi and would like 
to use it in the bundled ksh as well.

Are there any plans to include this functionality in the future (i.e. in the next QNX version)? Could you please take it
 into consideration?

Thank you



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General
http://community.qnx.com/sf/go/post91218