Maplestory revamp KMST videos.

Dark Knights look somewhat fun to me now, might make one some day. Crusher does deserve a boost though.

I think the thing with SP is the same as it was in GMST: You can add unlimited amounts of SP to a lower job advancement (so to 1st, 2nd and 3rd job if your 4th job), but only as much as SP as you obtained in your current job advancement to the job you are in now. I remember having a Bowmaster with all 1st, 2nd and 3rd job skills maxed, but I got an error if I wanted to add more SP than (level-120)*3+3 in 4th job (Cody gave out unlimited amounts of SP).

There are limits on how much SP you can spend in a job at a given level set in the client. If you play around in a private server, you'll get a popup when you try to add to 1st job at level 5.
It's something like if ( (Lv - 10)*3 + 1 > 0 ) { maxSPallowed = (lv - 10) * 3 + 1 } else { maxSPallowed = 0 } or something.

Basically what you just said. So... seconding Hurrycane.