OH no don't think about possibilities, or bother learning, building, developing new smills... just plug in and assimilate! 
jeeze...complicted? 
Ill timed maybe, but witb no mention of command... a rectifier is a sound option for many folk. IMO You perform a disservice without a technical explaination beyond "shut up" to back your opinion
Cutting out the middleman would be bypassing a manufacturer and shopkeep both by making one BTW 
One dpdt switch and one bridge rectifier isnt very complicated 
.
Twice the available wattage on the majority of "our ac transformers" too., room to fit a BR inside on the big ones, etc.
After all, we don't really know if the OP is on a 4x8 or 40x8, where the extra amperage could have real impact (not actually checked.. the MRC might be a monster?...not even the point ... the option offered was a viable alternative)
Of couse I wouldn't bother unless I already had an extra 3r ac throttle...
Especially since the MRC is on the way ....and for a song ....it's all redundant more or less.
But I'd have to think about the $10 in just parts instead of paying for those parts in a different package. Mostly because I have añ open throttle kicking around on most of my layouts anyhow.
