Annoing problems

Hi,
My client bought PERSONAL license.
i need help with few calendar features regarding “extras” mostly.

I got 3 items that are added in extras but it’s not functioning as i wanted to:
1. can’t multiple select. Some customers will want 2 or even 3 items. Even if I arrange items in three different Extras field, it does not count properly (always 1) witch leaves my client to edit calendar numbers and information’s manually after each reservation.

2. every item separately should have option to be grayed or red if they are ordered maximum times on particular date, or to prevent customers to select it. Every item needs to have it’s own count. It should not be manual work.

3. All information’s entered in calendar for Number Available, Price, Marked Price, Information for users, Information for administrators…are dissapearing if it’s clicked again after save – fields are reseted/empty.

That’s it for now.
Hope for your help or some better solution to this.

The page I need help with: [log in to see the link]