That would be a useful program!
Anyway, as to my comment about the smaller animations, that was because I was missing a frame.
main.dat section 0:
lemming animations - black = transparent
[0x0000] walking (r) 8 frames, 16x10 px, 2bpp planar, 40 Bytes/frame
[0x0140] jumping (r) 1 frame, 16x10 px, 2bbp planar, 40 B/f
[0x0168] walking (l) 8 frames, 16x10 px, 2bpp planar, 40 B/f
[0x02A8] jumping (l) 1 frame, 16x10 px, 2bpp planar, 40 B/f
[0x02D0] digging 16 frames, 16x14 px, 3bpp planar, 84 B/f
[0x0810] climbing (r) 8 frames, 16x12 px, 2bpp planar, 48 B/f
[0x0990] climbing (l) 8 frames, 16x12 px, 2bpp planar, 48 B/f
[0x0B10] drowning 16 frames, 16x10 px, 2bpp planar, 40 B/f
[0x0D90] post-climb (r) 8 frames, 16x12 px, 2bpp planar, 48 B/f
[0x0F10] post-climb (l) 8 frames, 16x12 px, 2bpp planar, 48 B/f
[0x1090] brick layer (r) 16 frames, 16x13 px, 3bpp planar, 78 B/f
[0x1570] brick layer (l) 16 frames, 16x13 px, 3bpp planar, 78 B/f
[0x1A50] bash (r) 32 frames, 16x10 px, 3bpp planar, 60 B/f
[0x21D0] bash (l) 32 frames, 16x10 px, 3bpp planar, 60 B/f
[0x2950] mine (r) 24 frames, 16x13 px, 3bpp planar, 78 B/f
[0x30A0] mine (l) 24 frames, 16x13 px, 3bpp planar, 78 B/f
[0x37F0] fall (r) 4 frames, 16x10 px, 2bpp planar, 40 B/f
[0x3890] fall (l) 4 frames, 16x10 px, 2bpp planar, 40 B/f
[0x3930] pre-umbrella (r) 4 frames, 16x16 px, 3bpp planar, 96 B/f
[0x3AB0] umbrella (r) 4 frames, 16x16 px, 3bpp planar, 96 B/f
[0x3C30] pre-umbrella (l) 4 frames, 16x16 px, 3bpp planar, 96 B/f
[0x3DB0] umbrella (l) 4 frames, 16x16 px, 3bpp planar, 96 B/f
[0x3F30] splat(ter?) 16 frames, 16x10 px, 2bpp planar, 40 B/f
[0x41B0] exit(ter?) 8 frames, 16x13 px, 2bpp planar, 52 B/f
[0x4350] burn(er?) 14 frames, 16x14 px, 4bpp planar, 112 B/f
[0x4970] blocker 16 frames, 16x10 px, 2bpp planar, 40 B/f
[0x4BF0] shrug(ger?) (r) 8 frames, 16x10 px, 2bpp planar, 40 B/f
[0x4D30] shrug(ger?) (l) 8 frames, 16x10 px, 2bpp planar, 40 B/f
[0x4E70] exploder 16 frames, 16x10 px, 2bpp planar, 40 B/f
[0x50F0] explosion 1 frame, 32x32 px, 3bpp planar, 384 B/f
The jumping animation refers to the action that a Lemming does when it reaches a height of terrian that it can scale w/o being a climber.