1)
Well the first one... just make it so it isnt a building like the normal ones, dont know if there is a option or a trigger for the normal race buildings, but dont think so, so use a shop or something like it as the building, but why you want to remove it? So they always will go the same place? If then make a trigger taht places the rally point every 3 sec..
2)
Dont understand what you mean? Do you mean the describtion for building building or for the summon item one or... ?
for 1) I mean like a the Set Rally Point button on a unit building.
2) I mean the Summon Building for the Acolyte for Undead
The first I answeared already, that trigger to place it every 0.5 sec to avoid players from placing it, else I dont think you can remove it any other way then using a buildign to create the units which doesnt have the rally point normally.
2) Simple, just change it in the object editor
Like there is a button when you select the building, where move, stop, attack are and I want to get rid of it.
For 2, where in the object editor, I looked everywhere.