D7 beta 3 Modification in "Page Builders"

Hello,

I would like to give advice on this section.
Would it be possible to add in the "Samples" the different blocks (html, special block etc...) of all applications and features.

For example I need to add a part of the block "Join.php" in mine home page, how can I do?

There is no such possibility until now in Dolphin.

It would be wonderful.

Do not think it would be a good thing?

Some blocks require data which is available on certain pages. For example it is impossible to add block with user's photos to join page, because viewing profile is is unknown. There is a lot of such problems with other blocks too.