UA Modifiers - Possible Changes?

Hello, everybody!
I was thinking about UAMs from heroes and who the metagame pacing could be different if they were more inclusive with the UAMs from items, or turned into buff placers (just like it was done with Fury Swipes and Burning Spear).

Imagine the combinations:
Mana Break with Satanic?
Searing Arrows with Desolator? ( Searing Arrows already works together with Eye of Skadi)

Well, it would open new windows for Silencer, Outworld Devourer, Anti-Mage (who is a little off-meta now, in my opinion), Drow Ranger (!!) and others.

Other change I would like to see is UAMs usable by illusions - with their damage against buildings reduced, to compensate the buff. Like Caustic Finale and Desolator, for example.

What do you think, guys?

PS: Say if my message isn't clear, I'm improving my english writing.

That's might be a bit unbalanced, though. And it would get really complicated which UAM stacks with which.

UAM passives were made UAM to balance these types of combinations. Yes it will be fun to play with, but would suck to play against.