Didn't you read the bit where frank pointed out the flaws in that approach. Ie that I can use manabarrier instead and it has less drain and comes up faster. It's even more effective, as while it defends those inside, friends of the creator are completely unaffected by it, so you can still lay down a barrage on those outside.
A mana barrier does not have many of the additional utility effects of mana-static. It doesn't also shut down enemy mages for one thing, which can be really useful when facing large numbers of awakened forces. What's more, a spirit can force it's way through a mana-barrier, but if they come into mana-static they are guaranteed to suffer some kind of ill effects.
I don't disagree that tweaking the effects of mana-static might also warrant tweaking the drain-code, I'm just arguing that there is a place in the game for effects which take a little time to prepare. It's the same as, say, setting a bunch of trip-wire explosives; a perfectly valid and effective tactic if you have the time, and if you do it properly. Not every group of runners is going to make use of it, but then not every group of runners makes use of many of the more interesting spells. They're still there for the people that do find interesting ways to build tactics around them.
In the end, nothing else out there can match the ability to deny 10 enemy phys-ads access to their powers whilst your party of mundanes wails on them, all for the cost of your mage not casting some spells which enemy spell defence would likely nullify anyway. If that effect comes with some required preparation, I don't particularly see that as unreasonable. Sure, not every party has just a mage and a bunch of norms, but then not every party is going to make use of these kind of tactics.
As always, your mileage may vary, but I'm offering up a different way of looking at the game. I've never really seen Shadowrun as a pure "run-and-gun" action game, and that should be reflected in more than just the legwork, but also in how your players react to situations during play.