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#TI-Basic, 141 bytes

Prompt L1
L1(1→T
L1(2→D
seq(L1(C),C,3,dim(L1→L1
If T>0
Then
For(A,1,T
L1(1→B
For(C,2,D
L1(C→L1(C–1
End
B→L1(D
End
Else
For(A,1,-T
L1(D→B
For(C,D,2,-1
L1(C–1→L1(C
End
B→L1(1
End
End
L1


Explanation:

Prompt L1                # 4 bytes, input list
L1(1→T                   # 7 bytes, turns
L1(2→D                   # 7 bytes, depth
seq(L1(C),C,3,dim(L1→L1   # 18 bytes, remove turns and depth from list
If T>0                   # 5 bytes, if turns is positive
Then                     # 2 bytes
For(A,1,T                # 7 bytes, do this 'turns' times
L1(1→B                    # 7 bytes, backup the first item
For(C,2,D                # 7 bytes, shuffle the rest along
L1(C→L1(C–1               # 12 bytes
End                      # 2 bytes
B→L1(D                   # 7 bytes, restore the backup to where it should be
End                      # 2 bytes
Else                     # 2 bytes, if T is negative
For(A,1,-T               # 8 bytes, do this -'turns' times
L1(D→B                   # 7 bytes, backup the Dth item
For(C,D,2,-1             # 10 bytes, shuffle the items the other way
L1(C–1→L1(C              # 12 bytes
End                      # 2 bytes
B→L1(1                   # 7 bytes, restore backup to where it belongs
End                      # 2 bytes
End                      # 2 bytes
L1                       # 2 bytes, implicitly return