questions about email in iOS7

Hi all, I posted this soon after iOS7 was released but it may well have got lost in the furore of more important issues following release. Anyhow, apologies for duplication. I have two questions concerning Mail in iOS7: first, in Mail as it used to be you could limit the client to downloading only the most recent 50 messages from an imap account. This now seems no longer to be the case. Am I right? If I am, should i be concerned that I have an imap account with several thousand messages in there or is this nothing to worry about? I notice incidentally that you can still limit exchange accounts to synchronising only the last three days, or week, and so on. Second, I used to like the fact that in Mail I could search by from, to, subject or all. I thought this really intuitive. that now appears to have gone. Again, am I right? If I am, I would be really interested to hear how other folks have foudn the search facility in Mail. The old search function was really useful when I needed to bring up a communication from my corporate mailbox which has many, many messages stored in it.