What do you think about letting more abilities to affect towers?

And obviously, buff tower accordingly to not make it any weaker than it is now.

Right now Bard, Janna, Rammus, Sion, Tristana, and Ziggs can affect towers with abilities that aren't just empowered autos. What do you think about letting more spells affect towers, instead of just autos and empowered autos?

The main goal I'm looking at through this change is allowing spellcasters to be better at taking towers, but we can't let every spell affect towers, because of the safety some spells offer, most prominently range. So what if we add some more spells to take towers with? Selection would be based on the champion strengths, how easy it is to use spell to attack tower, and opportunity cost of holding in the ability vs using it to damage towers. We can see Ziggs' Satchel Charge follow similar concerns. Ziggs passive already made Ziggs a decent tower taking mage, so the strength was pushed. In addition, Satchel Charge is his only escape tool, so there is high opportunity cost to using this. Another thing we can look at is thematics, but that should come after gameplay concerns. This would also help with letting non marksmen into bot lane.