There may be but not that I know of. I just change the font-size and the table size will adjust. If there is a long row header like "number of workers at this site" I put <br/> after every 2 words or so. Same with forms, just change the font-size.
Here are 2 examples I just found on web that show you can set width of each column but not entire table...
<TABLE BORDER>
<TR> <TD WIDTH=200>watermelon</TD> <TD WIDTH=400>Georgia</TD> </TR>
<TR> <TD>apples</TD> <TD>Washington</TD> </TR>
<TR> <TD>blueberries</TD> <TD>New Hampshire</TD> </TR>
</TABLE>
<TABLE BORDER>
<TR> <TD WIDTH="80%">watermelon</TD> <TD WIDTH="20%">Georgia</TD> </TR>
<TR> <TD>apples</TD> <TD>Washington</TD> </TR>
<TR> <TD>blueberries</TD> <TD>New Hampshire</TD> </TR>
</TABLE>
I wouldnt doubt it if it accepted <table width=600> either.