Thanks for your reply.
I can't disable the time limit to edit a poll, the best I can do is make it 9999999999999 minutes (this is the same for editing a title which again is really silly IMO and needs a disable function.) Many of my members have long running threads (running for months if not years) like diaries etc that they want to change the title / poll indefinitely and I don't have a problem with allowing it.
Re: the poll deleting, all I want to really do is to let them change the poll. For example we're bound to get a huge thread on big brother, with debates etc along the way. The first post will usually have a poll "who do you want to evict this week" which we'd want to edit each week with the names of the relevant contestants.
When we had phpbb before, a member could simply delete the poll and create a new one, not affecting the first post at all.
Sorry to sound a grump but I was really liking this new software until this whole poll issue came up and I can't see any good reason for it to be the way it is.