Interspire Shopping cart Modification

Hi, we would like to have a custom implementation to INTERSPIRE CART system. We take care of licence and hosting the script on our server. We'll give you a dedicated ftp and db access. We need two task completed in PHP (the script is 100% open). You can also access their developer's docs at [login to view URL] or we can send them to you. - Add multilanguage feature. The script already allows the admin to translate the entire system in another language. We need to add up to 10 languages for everything: Meta Description, texts, titles, payments, static pages...ecc Users should be able to select their own language (flags or dropdown menu) in every page. We also need changes in the backend so that, at every input we can insert the translation for that item on one single page. Example: adding a product should show among standard fields, one filed for each active language where requested (title, description, options, shipping....). An ajax, tabbed or uncluttered interface is a must. Things should look professional and easy to use. -Multi Vendor Option 1) "Allow Purchasing" option available on each vendor instead of the whole website, look at the current code (in Store settings) and apply it onto vendor settings - this features allows admin to enable or disable the shopping cart function on any vendor instead of the entire site 2) Add an extra field in vendor settings for paypal id.. and reroute transactions to that variable - right now all transactions are flowed to the main payment gateway, we want each vendor to recieve their payments directly from buyers (via paypal). 3) Integrate Joomla and Interspire login: -both userbase will sync up (by email addresses) -import certain user fields from Joomla during the sync -a user who signs in to the Joomla website will automatically be signed in to Interspire website 4)Vendor rating and feedback ala ebay 5)Current Top Sellers -Joomla/phpBB/Magento/vBulletin/PhpProbid integration -image watermark,the ability to upload a watermark image to automatically watermark all product images including detailed and additional images. -Facebook store Create a facebook App that woud export selected inventory to a Facebook store page. -iphone interspire app,Would like an iphone app to take orders through interspire. Simple flick through pages with typing and product selection, credit card numbers etc. Could upload at the end of the day into interpire on laptop through USB. -Adding Facebook login Icon on Home Page -Affiliate ecommerce program -Shopping minimum amount module(example:there are free items on the store but a customer have to buy something to get that free item) -Booking Calendars. Ie: classes, services – with payment. -Vacation rental/booking engine -Product as classes for online booking of services We prefer someone that is familiar and worked with interspire products as we may need more modifications down the line, and would like the same programmers on the [login to view URL] the job is finished you will provide online demo. If we chose you,20% escrow and other 80% when the job is finished.