that's correct.
There are way around it. but it intails a bit of coding. In theory, you can have a different form that separate form perhaps in a layer that would populate the table and as soon as submitted the drop-down would contain the new entry. But I'm 99.99999% sure you can't type into a drop-down box. I believe there's a FAQ in this forum about this.
The path of the righteous man is beset on all sides by the inequities of the selfish and the tyranny of evil men. Blessed is he who, in the name of charity and good will, shepherds the weak through the valley of the darkness. For he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee....