Latest system menu for M3i as of 21 - 04 - 2010. Didn't see it posted here.

Code:
Change Log of 21-4-2010 4.8a x
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1.Solve the problem of adding the soft-rest function for Game 4826,4827,4828,4829,4833,4834,4835,4843,4853,4864
2.Solve the problem of adding the RTS function for Game 4825,4827,4828,4829,4833,4834,4835,4843,4846,4851,4853,4857,4858,4871,4872
3.Fix the compatibility of game 4813,4824,4825,4828,4829,4830,4833,4834,4835,4843,4846,4851,4853,4857,4858,4861,4862,4863,4864,4871,4872

(game tested up to 4877)
Download: M3DS System Menu 4.8a X (Link currently seems broken)
Download: M3 Sakura v1.47 2nd + System Menu 4.8a X (Recommended)