Finder EXPAND ALL and COLLAPSE ALL (with subfolders)

i deal with a lot of data and i would very much like a feature that lets me expand all folders (and subfolders) and collapse all folders (and subfolders). the reason i need this is i sometimes want to dig out all the contents of a set of nested folders or view them in coverflow (what an invention!!!!). if i do this manually it involves a lot of carpal tunnel inducing repetitive and very tedious operations and - conversely - when i am done i have to manually close up all these folders or finder (i believe) will remember to leave the ones that were open opened which means i either have to clean this up then by closing all the folders or i have to do it later when i open them.

i tried to address this about a year and a half ago and i can't recall if i got good answers to get this finished or not but i do know that some of what i said may be technically incorrect but when taken as a whole the system is glitched enough to cause a lot of repetitive work and the rationale is confusing enough to make it hard to figure out why it is doing what it is doing (if there is any reason except sheer oversight in any case).

THANKS for any help. my wrists are absolutely killing me as i write this...