cycling between resolutions in X

[Hector Akamine <akamine@example.com>]

X lets change the screen resolution, using [Ctrl]+[Alt]+[+]
Is is possible to change the number of available colors in the same way?

For example, my video card supports 1024x768 32-bit, 1152x864 32-bit but
doesn't have enough memory to support 1280x1024 with 32-bit colors. Is
it possible for example to cycle to 1280x1024 16 or 8 bit in the same
way (Ctrl+Alt+ +)? In that case, which modifications should I make to
XF86Config?


Thanks in advance

Hector