Same feeling. I would remove bias_learning_rate, bias_regularization and init_bias_*. 

The SGD has an intercept_decay variable in the Cython code but it's hardcoded in the Python side:
https://github.com/scikit-learn/scikit-learn/blob/master/sklearn/linear_model/stochastic_gradient.py#L236

However, I would had a fit_intercept option.