simple_comment_rate.module
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line 40: ...

simple_comment_rate.module
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line 40: $type = substr($comment->node_type, 13);
why are you doing this substring ?

in function simple_comment_rate_menu()
the title and description should be enclosed in t()

for variable_get('scr_choose_how_to_vote', 0) == 0) ? "ips" : "uids"
I feel it would be a better idea to store either 'ips' or 'uids' in the variable instead of 0/1

line 215, 235 & 261: unused variables.

simple_comment_rate.install
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line 64 & 72: $query = db_insert('role_permission')
$query is not required.