Copy/Paste in System Tables

I'm sure I'm not the only one who's noticed this: I've created a system table meant to hold text for a production, but when pasting copy into the cell, nothing happens unless there's a pretty limited amount of text being pasted. So if you've got a long line of text (my column is set to varchar(max), so it's not a matter of over reaching the field size), the only way to copy and paste into it is to do little snippets at a time. Just wondering if anyone knows of a better work-around for this situation.