1) We can now have 10 lines in our signature and have a limit of 600 characters, including BB code. We complained to the administration and we got it - let's not screw ourselfs and ask for more
Also, my sig is huge and I think that this is a good limit, because if it were any bigger it would be a burden
2) The moderators should take charge of telling you such things if they were a problem. If they were deleted, it's no big and I just let it brush by me. Edit - I also agree with Anthony below. Posts are deleted for a reason and if you follow the forum rules you won't have any problem with having your posts deleted.
No offense, but that's my opinion on it