You know how in FE9 and the DS games support points were gained simply by deploying units together? Now in FE7 you can do the same thing! Just make the following changes to your ROM, and all compatible pairs deployed on the map will have their support points go up by the normal amount once, at the beginning of the chapter.
-0x026948: Paste write 000004E0
-0x0268A6: Paste write 6DD1
-0x0284E4: Paste write 000004E0
-0x028442: Paste write 6DD1
Alternatively, if you just want units to gain support points for being within a range of each other rather than only being adjacent, make the following change:
-0x026948: Paste write 0328 04DD; the 03 is the maximum distance from which pairs can gain support points
-0x0284E4: As above
I also have plans for a system in which units can gain support points both for being deployed together and for being adjacent, but that’s a bit of a longer-term project.