New to LoL coming from HoN

I'm suggesting that they make a fix like HoN has which would greatly increase game play. Such as when a team player is on top of an enemy and you can't target the enemy with a spell. Like as you mouse over a team member with an enemy target-able spell, the team member has like 50% opacity and you can therefore target the enemy who is behind and hidden. Really frustrating when you are unable to cast a quick spell off when they are hidden behind someone. Would make it more effective for team fights when there are 7-10 players all in one little area and you really need that last hit off on the right player, before they run out of range.

Just my thoughts, feel free to leave any CONSTRUCTIVE criticism

I can see where you are going with this, but how about abilities that want to click on allies? How about a champ like Lulu, whose abilities can be used on both allies and friendlies? Any ideas on addressing this issue?

There is a target ally button for abilities as well as " ` " (the key with ~) which allows you to target only enemy champions. LoL has had this for years, it's difficult to discern who you actually want to target automatically, but I don't think an ally will actually stop you from casting a skill on an enemy if they're overlapped