And a macro that left-aligns it:
leftalign = { \once \override Dynamics.DynamicText #'self-alignment-X = #-1 }
Heretofore, I've just been manually adding the \leftalign before the
\rinforzamf (for example). Is there a way to get both of these in one
command?
Ok, here is the deal: this is an override, which is something happening
at a single timestep to _everything_ in the current context. If you
want to combine them, you rather want a tweak, which is something with
its effect confined to what you are tweaking.
rinforzleft = \tweak DynamicText #'self-alignment-X #-1 \rinforzmf
should do the trick.