With the server having Buff and De-Buff Timers available on the right of the screen, if you buff yourself first then all the other party member(s). You should have a rough idea when their buffs are going to expire.
I like the idea of the SP registry (but I'm not on the geeky side of RO to know how plausible it is to add anything) and as other people have stated, we could hotkey spam to get what we need (or just carry our own sp refills).
Out of the two ideas, I think the SP would be the most plausible one.