textarea form

i'd like to have a text area in the form, however the form output from the control panel only includes text fields.
i'm presuming i can just swap the type in the html, however is there a maximum character figure i should be aware of. i've seen on some post that 250 characters is the maximum... i'd kind of like to combine newsletter registration with standard contact form with a comments field which would require the ability to add more than 250 characters. if its not possible i'd have to do another form using some other form to mail script... your form for the mailing list and perform manual merges unless someone could make suggestions...

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