vtiger crm fix and customize

We are looking for someone who is an expert in vtiger crm. So please respond only if you have worked with vtiger crm before. Please mention previous work done on vtiger in your response. We currently have a vtiger 5.3.0 crm installed on our server. We need the following fix/customization done: 1. Include signature(with image) in the emails - both new and replies 2. Currently we cannot delete multiple emails in the Mail Manager. Fix this. 3. Currently the emails sent from the vtiger Mail Manager (and Webmail) is not saved in the IMAP server. Fix this so that all outgoing emails are saved on the server. If that is not possible, have all emails sent through vtiger be copied (BCC) to the user email automatically. 4. Currently if there is a recurring event in the calendar, we have to individually delete each occurence of the event. Fix this so that we are able to delete recurring events in the calendar or delete individual occurrences of the event. 5. Add an ajax script to the calendar so that when a user puts the mouse over the event on the calendar, the title and location of the event shows in a little box. 6. Add the following Workflow: 1. A Todo is created every time one of the custom date fields in the contact list is updated. For example, when a user adds/updates the "Next Contact Date" field in the Contacts list, a Todo event(with notification) is automatically created for that contact for the specified date, that says something like "Call xxx contact on xx-xx-xx date" Communication is very important. When you respond with your bid, please make sure you clarify what can and cannot be done on each of the points mentioned above.