The ROA Buffs should be for Meele only.
ROA was always a battle mage or ap bruiser targetted item for champions like
even reworked ap gragas 
but instead it just ended up being abused the hell out by
while most ap bruiser actually skip ROA now because they are usually too behind in the early game vs a laning mage to benefit much from rushing it while anivia cassio have big cs lead over them and just buy the item way earlier same for tf with his passive and they stack the same stats while having a way better setup to buy it...
Just my opinion if you made some small changes like that maybe you wouldnt have to gut every mages mana regen because they end up bullying some people in lane and give those who struggle a little bit of help instead of nerfing mages when adc are like idk not balanced maybe?
, it's just more beneficial (and yes this one should be melee only imo, eve tho I love mages, it's purely cancerous to deal with the champs you mentionned who build it)
.