editor questions

Ive been doing map making for a while and i might seem a little stupid asking these questions but,

#1 is there a way to hide icons for units requiring upgrades, like how headhunter get replaced by zerker.

#2 how do i change attack speed of normal units (nonhero)

#3 is there a way of editing spell buffs like spiked carapace and such? Trying to make horns come out of head.

#4 can you make custom heros that have a level, levelup, exp, but dont count as heros and cant be revived?

thx hoping for answers soon

#1 Yes and no, im not sure if you can totally hide the icon, but you CAN change it.

#2 Im not sure.

#3 I think if you make a new model, change the spell co-ordinates, you can.

#4 Yes you can, but they WILL count as heros and if you change the trigger for hero revival and edit it so it cant be revived, it wont revive.