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There is already an undo button. Hit "U" to undo.
Thanks. I noticed this issue this morning. I'm going to get this fixed and issue a patch.
Working on performance issues for 0.4.5. Should be a good deal faster on these levels.
I'm going to be moving the login system to the updater, so this won't be an issue for much longer. This was released with 0.4.5
There is now an updater where you login, so this is no longer needed. :)
I improved large design performance in 0.4.5
I fixed this in version 0.4.6
Customer support service by UserEcho
The new updater allows for this.