I want to: use one theme for multiple Wordpress sites (single installations).
The reason is simple: i want to be able to update the theme once for all of my sites (well not all but a group of them).
Now I know: i can use multisite. but i really don't want to, because for this specific group of sites it will cause some very complicated issues that i don't want to deal with and maybe some more that i don't think of (which make me worry even more :)
And I know: i can use "infinitewp", "managewp", "cmscommander", "wpremote"... but i have a few problems with them: 1. they will cost a lot if i want to manage a large number of sites :) 2. i will be updating the theme (code it) my self rapidly and will me much easier to just update the code in his folder then login and update for every change. 3. i'm not sure i can even use a folder upload method in those applications and the auto theme update method won't work for me.
What i Thought of is:
Maybe: can i use
register_theme_directory function to set the theme directory of all of my sites to one folder on my host (not located on any of this group sites folders). Is it possible? will it be a good idea? or a risky one?
UPDATE: I got one good answer but i will be glasd to hear if you have any other opinions / suggestions to add...