Should there be a warning for players when an invisible Shaco is nearby?

Absolutely not. Surprise is Shaco's ONLY positive attribute. The reason people die to Shaco is because they try to run from Shaco. Fight him and you'll win 9 times outta 10. He's squishy as hell, his burst almost always isn't enough to kill, and his only form of hard cc is in the form of a killable unit that takes time to activate.

Trust me, Shaco has way more negative attributes than positive.

No.

does shaco jump out of stealth, snare you mid leap, land with a crit auto and a q auto reset + W + hydra? all within 0.5 seconds?

He shouldnt. Shaco is different in various ways. First off, his stealth isn't permanent or even somewhat medium duration, which means regular wards will spot a shaco if he doesn't wall hop. A second point is that shaco is the only one of the three that is affected by his position relative to his opponent. Which is relevant in a game without turn rates.

Aditionally, as compared to Rengar he doesn't burst as fast, and is generally squishier. He also doesn't get an MS steroid in his stealth.

Would write more but will lose internet access now.

I just think needs to be available on Summoner's Rift. And if it is, I can't find it.

The boards like Shaco for reasons I can't fathom, so no.

Nearly his entire kit is based around dodging, juking, and "tricking" with Q stealth. If an indicator was put in for where he is, his abysmal winrate would drop even further. Bad idea :/

he has one. a poof of smoke.

I think he should get one to be fair to all of the other invisible champs.

Yes.

I think Shaco should have a 5% chance every second to fall over and stab himself like the clown he is.

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Rengar gets one, Eve gets one, so why not Shaco? Thoughts?

Because normal warding will provide you the sight you need in order to see him since the distance on his Q gives is pretty short.

Rengar gets one because he can delete pretty much anyone with his ult and snare q combo.

Eve is really pretty shitty anyways, since they've gutted every aspect of her kit, and the only warning you actually get is once she's in range to do something to you. Your response time isn't enough to avoid everything she can do.

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Rengar gets one, Eve gets one, so why not Shaco? Thoughts?

No, stealth is stealth.

Rengars mark should be removed, after he is balanced. The mark is only an excuse to not balance him.

Eve doesn't warn her opponents, but she is not invisble if she is too close. Her marks warns herself, if she is (almost) too close.

I think it might be due to it only being 3.5 seconds no matter what level he is or what rank his Q is. But that is just my guess.