If I remember correctly, no. I do not believe they have made an update to add them yet, that may be what they are currently doing, I do not know (I hope they are fixing the problem with the images though!). If I am right, it is because a Steam Account does not contain the required information for a wiki account to be created, while a traditional SK account can merge with your Facebook Account to give exactly what is necessary for wiki editing. If you want you can always make another account specifically for editing the wiki, many Steam knights do this (or did, I'm not sure if it has been changed).
If I remember correctly, no. I do not believe they have made an update to add them yet, that may be what they are currently doing, I do not know (I hope they are fixing the problem with the images though!). If I am right, it is because a Steam Account does not contain the required information for a wiki account to be created, while a traditional SK account can merge with your Facebook Account to give exactly what is necessary for wiki editing. If you want you can always make another account specifically for editing the wiki, many Steam knights do this (or did, I'm not sure if it has been changed).