FWIW, I've updated the code to support the single dropdown option being used across single and multiple attribute options including keeping the customid. I may have found on SBA 1.5.3 for ZC 1.5.1 that in the sba_sequenced_dropdowns that there might have been an extra displayed } in the javascript. I've removed it from the uploaded file so it may resolve an issues seen previously, it may cause it. :) Let me know if this caused an issue. May need to run through the install again on a clean system to see any negative effects.

Also, almost have a general use of READONLY attributes incorporated for say sequenced dropdowns so that their info will still be displayed and in the sequence desired, just not interfering with the remaining operation. :) I say almost, though there is still a bit of work to do and some general testing.