in the 6 months i played on HG i have submitted roughly 5-10 segestions. all of them would take less than 3 hours each to code, debugg and impliment. all were valid ideas, none implimented.
i am not the only one, i do no recall anything new ever being added to the server via suggestion. ( note this does not include map list changes, bug fixes, or changes in settings.) so to conclude in a blunt fashion, they don't care.