ID:133564
 
You know how you can switch colors by locating colors and changing them? How about we can do that with alpha colors? It will take much less time than doing it one at a time!
You can. Set Edit to "Alpha Only" and then use Swap.
In response to DarkCampainger
What? Go through the proccess, I do not follow. I'd like to make a color transparent for like, all slides... without just coloring it in one click at a time.
In response to Puckaboo2
Ah, sorry. I didn't realize you meant all slides at once, I thought you meant all colors at once.

I suppose it could be useful, but how would they implement it? They do have the Color's Edit menu tool, but I don't know how they would distinguish between transparent colors and colors that are just lighter.
In response to DarkCampainger
They could put a box up that says "Do you want Alpha?" And it can show the yes or no buttons. And if you click yes, it can say "Type in number from 0-255"