This whole spark issue to me, is only a problem, with current population and political climate. And there is no point in tailoring critical game mechanics to this current population and climate.
It is funny that you guys keep saying that we have unlimited sparks and combats toons set to all outposts. Personnaly I have one spark on the blue islands and one for the red islands. That's it. And most of the people I know are similarly set up. So if something happens at that one spark location, then great. But more often than not, I am driving my happy *** from my nearest spark location to wherever the action is. As is most of my corp.
And to me that is the intention of the spark teleport. Not to be able to go everywhere instantly, but to have a few bases of operation scattered around the game to prevent you from having to trek across the world to do anything. By installing a cooldown, you reverse the point of spark teleport in general.
Now, the problem lies in the fact that one Powerbloc has control of most outposts. And that our enemies are weak and lack the stomach for the fight. So when they see 2 people undock at an outpost or inside the station, they assume everyone is just a spark away. When in reality this is rarely the case. To me, this is part of strategy of warfare. Is this their stronghold? Do they all have sparks here? Or maybe we find a lesser used station that few of the enemy have sparks at. But instead of putting some alts inside stations to monitor enemy activity, or keep track of who sparks in during possible engagements. It is much easier to just start a forum topic begging for a change to game mechanics.
Adding a cooldown to spark teleport would hinder the current powerbloc from defending all their outposts, but probably not enough to matter much. It would make people think twice before sparking to engage in PVP. But is this really what we are trying to achieve? Having people afraid to spark to PVP because there may be Better/bigger/ more important pvp elsewhere? I am not in favor of a mechanic that will reduce peoples inclination to PVP. That is already a big enough problem as it is, without making it worse... The real problem is that STC has more active players than any corporation in game atm. It will always be hard for a few people to wage war against a numerically superior force.
Now, if a corp only had 1 or 2 outposts, the spark cooldown wouldn't do much to help the "blob" you all speak of. Chances are the sap times would be different enough to allow everyone in that corp to be able to spark to both outpost defences when needed.
Now, if a corp (12/62, PHM)doesn't have any outposts that need to be defended, the spark cooldown has no effect on them. As they are walking from whatever rock they are crawling out of. And have no need to be able to defend anything. So if I don't have an outpost or gamma base to protect, then I would be all for this cooldown mechanic as well.
But to me the biggest problem with this whole idea, is that when I spark over to a beta outpost on the slim chance of getting some great pvp action, and my enemy decides to blueball me and runs away. I have to spend the next 45 minutes driving 3 toons across the game world from Dom back to imidero. Or I can log out of perp and go play some other game while I wait for my cooldown to expire. Is this also what we are trying to accomplish?
This game already requires significant amounts of time to gather resources, manufacture, make NIC. Why do I now have to be forced to spend 45 minutes walking across the world everytime I want to try and PVP. I just don't see how this would do anything other than make the game more tedious.
Bad Idea -1
Those of you lucky enough to have your lives, take them with you. However, leave the mods you've lost. They belong to me now.
Scarab Kill Count:2
you could set it up in a way to make the difference between a dead spark (meaning bot destroyed on the field) or just a spark teleportation. 
