Well, I just hit 10 SCH, and lets put it this way...Strategems are pretty hot, but right now they're broken. In short, you can go into negative charges if you use macros for your strategems, down to -2. In long-winded form...here's how SE described Strategems:
That's all well and good, but there's a pretty big bug right now. Think of Strategems like Corsair rolls or Blood Pacts - you go into you JA menu, select Strategems, and then within that there's a menu for all your available Strategems (only the ones available corresponding to which Dark/Light Arts you have active are shown in the menu). On the right hand side then, it shows the number of charges you have, and the timer for when your next charge becomes available.When a scholar gains access to Light Arts and Dark Arts at level 10, he or she will also acquire new abilities called “Stratagems.” The abilities available within Stratagems will correspond to the type of Arts the scholar currently has activated. No abilities will be displayed if neither Light Arts nor Dark Arts has been selected.
Stratagems do not have a recast time. However, the use of these abilities is restricted by the number of “charges” available, with each ability consuming one charge per use.
*When using the “/recast” text command, it is necessary to nominate a specific Stratagem to which the scholar currently has access, such as “/recast Celerity”. This command will display the amount of time remaining until a new charge will be generated, as well as the current number of charges available.
The number of charges available depends on the level of the scholar.
When set to the main job, a scholar will have one charge available at level 10, two at level 40, and the maximum of three at level 70. When set to the support job, a scholar will always have a maximum of one charge available, regardless of level.
Charges will be regained at four-minute intervals, meaning twelve minutes are required to regain three charges.
So for example, let's say I use Dark Arts, and then use Parsimony. I gain the Parsimony buff (reduces the MP cost of my next black magic spell by 50%), lose the 1 charge I had, and the timer starts counting down from 4:00. Now here's the bug. Obviously, I shouldn't be able to use Parsimony (or any Strategems for that matter) for another 4 minutes, since I don't have any charges left. If I open up the menu, click Strategems, and try to click Parsimony, it gives the "You must wait longer to perform that action" error, which is obviously correct. BUT, if I use my macro - in this case /ja Parsimony <me> - Parsimony goes off! I get the Parsimony buff, and it works just like it did before, as if I had another charge, even though I didn't. In the menu, if I check out the charges on Parsimony now, it shows up as -1, and restarts the timer. Soon as I cast another black magic spell, I can do it again! As long as I use my macro, my charge count will go to -2, and I get Parsimony again. The buck stops here though, even using the macro I can't go beyond -2 charges. Not that I'm complaining, hehe.
So basically, right now a level 10 Scholar gets 3 Strategems charges as long as they use macros. Obviously I have no idea if that means a level 40 SCH gets 4 charges, and a level 70 gets 5 charges, but it's probably safe to assume this will be fixed before anyone hits 40 SCH, or at the very least before 70 SCH.
One last little wrinkle to this: the same goes for if you have SCH subbed. I just tested this as 75RDM/10SCH. Used Light Arts, hit Penury (white magic version of Parsimony), cast Protect IV on myself for the low low cost of 33 MP. Immediately after, I hit Penury again, and sure enough, another 33 MP Prot IV. And yet again, bringing me to -2 charges. Incredibly hot and I wish I had time to do some serious damage with this (though as a RDM I can't really do much...a BLM/SCH right now though...omg) but alas, tis time for dreaming of turkey. Hopefully when I get back Friday this won't be fixed yet and I'll play some more with it, hehe.
lolSE