Can Product Title Link to Node?

You can implement theme_uc_subproduct_cart_table_form in your theme and in this bit

foreach ($form['#display']['columns'] as $field => $format) {
  ...snip...
}

You can test if the value of $field is 'title' and then if it is, use your own output.
Alternatively you can implement hook_uc_subproduct_fields and hook_uc_subproduct_formatter in a custom module to a) notify uc_subproduct of a custom field (linked title) and then b) provide the output.

I'll leave this as a feature request.
Lee