BuddyPress.org

1 – i want to remove comment page from my home page of the site for login users. ( Kindly Suggest How I Can Achieve this ) When i try to remove it it says link not found error on the page i do not want any error there. Can i open some other page while opening site without even showing page link to the people .

2 – i want to remove Nav menu for logout users. only logged in users could see.

3 – i want my site in 2 languages only english and portuguese. tell me how i can achieve this. Localization .
and also few knowledge about internationalization.
Can anyone tell me which one thing i should plugin into my site. Internationalization or localization.
Tell me about both .

4 – I want to increase the size of profile picture form. so that profile pic look big like facebook and orkut. i just want to increase height of the picture.

5 – I want to increase the size of the picture cropping. or tell me the way to remove it. while cropping it just crop in rectangular shape. i want to increase height size of cropping or remove the cropping option from the site.

6 – Best album plugin , video plugin ,for profile.

7 – Want to increase header width . and decrease the header height.

8 – Remove default Search Bar. and need a plugin which can search globally across the site without selecting options of searching.

9 – How i can speed up my site. as need fast searching so is there any plugin to make the site fast. If yes then give me the link of that plugin with best way to configure that plugin also step by step process. social sites need fast searching.

Using Buddypress 1.2.8 and WordPress 3.1

Whope i will get all the solutions as soon as possible.