Howdy-
Thanks for nicely addressing this question that apparently got lost in the shuffle.
Indeed, REML has more considerations that 'just' running 3dDeconvolve. I just wanted to note for any future readers that the cited, handcrafted notes and further discussion about REML in the case of censoring (which might also be of interest to people) are contained within this section of the documentation:
https://afni.nimh.nih.gov/pub/dist/doc/htmldoc/statistics/remlfit.html
As to this comment:
Quote
I'm not aware of a convenient/straightforward way to generate whole volumes with AFNI functions but do not believe that would be a worthwhile endeavor anyway.
... isn't 3dREMLfit the convenient and straightforward way to generate those whole volumes?
--pt