Too basic and no control

I have the simplest of forms. Just an email. The text that appears next to this field on the left is ‘Email Address’. That’s fine (but I would much prefer an in-field label so it leaves more room). But the real problem is that it says ‘Enter email address’ on the right hand side of the text box. That wraps around on to a second line because it is too wide for the 300px sidebar I am using. And I have no control over it whatsoever. Can’t turn it off. Can’t even make the text colour white to hide it (why would I want to tell my poor subscribers twice to enter an email address?). The problem with this plugin is that you have almost no control over any of the formatting. The ‘submit’ button cannot even be coordinated into your site colours. If these things were fixed it would be grand.