Quotations getting lost when cleartextsigning

Hi!

First of all, thanks for FireGPG!

My question:
Is it normal that when selecting all the message text and choosing "cleartext sign", all nested quotations from former mails in the conversation get flattened? (In RTF/wysiwyg mode)
Or should I only select my own part for signing instead of the whole message inclusively quotations?
What do I do then when I reply to quotations line by line? (Like one line each for Question, Answer, Q, A, Q, A, Q, A ...) I certainly can't sign every single line.

I don't want to use "sign" instead of "cleartext sign" since I want the message text to be human readable, but with pgp signature.
I'm not sure if I understand this correctly, though, since I'm pretty new to encryption!

(gpg --sign seems to encrypt the text, but on the other hand I've read that you can use --sign together with --encrypt...
So what's the difference between --encrypt and --sign?)

I'm also having the problem of many signed mails to have an invalid signature in the end. I can't tell if that's due to the above problem (quotations flattened) or due to the "Show hidden quotation" link (which was said to get fixed asap in february?!) or due to another problem. Copying the message text to a text file and --verify -ing it doesn't work, either: "Wrong signature from ...@..."

Thanks,
Lab