No, it is not possible to manage the "other" folder both on the phone as well as PC, the only way to reduce it is hard reset or any software update, this is one more reason i like to be on developer preview as i get updates after every few months and get to reduce the other size, the last small update(yesterday) on Dev preview reduced my "other" from 400MB to 4MB
And small amount of Other storage is expected, you can google and find that even iphone has "other" storage, it just means files which are left over and the OS can't understand or read it.