This sentence is a little awkward, maybe:

What is the procedure to request an experimental build of the ports tree, also known as an 'exp-run'?

s/requires/requests/ ?

s/Full builds/A full package build/

I don't know, I want it to be clear that it is not something that is optional :-)

I kinda liked having it as a plural

Sure, but it is optional... :)

I was just thinking, a full build of what?

And if you don't ask for it and break it, you'll get crucified :-p

I changed it to "Full package builds"

"What is the procedure" is still a bit redundant. Also, "test" is helpful to make the purpose clearer.

How can an experimental test build of the ports tree (<emphasis>exp-run</emphasis>) be requested?

Please, not "you".

<para>Full package builds will be done with the patches
provided by the submitter, and the submitter is required to fix detected
problems before commit.</para>

No, please, no "you".

Fill in the bug report as normal.

Negative logic: if !(forget). Use positive logic:

Remember to attach the patch.

This is more confusing because it asks for the opposite of what is needed.

Also, "you are good" is ...not good.

Please remind me about this later when I have more energy.

This assumes a certain page layout which might not always be that way. Can probably just say "Set the flags to..."

No, please not "your" unless absolutely necessary.

Hovering the mouse over any field shows more details.

s/the &a.portmgr;/&a.portmgr/ (I think).

s/answers back/replies/

"fallout" might not be clearly defined to the reader.

Please, no "you" or "your" except when needed.

The fallout might be a bug in the original patch or other ports that need to be fixed. 
Both need to be addressed.  Update the patch to repair all the fallout and repeat.

It sounds better, most other questions start with "What ..." so I went with it :-)

Is this the polite way of saying "you have to" ?

There are "you" and "your" all over the place here, it always was less formal than the rest of this article.

Without "the" it reads:

When Ports Management Team <portmgr@FreeBSD.org> replies,...

The polite way is "must", like

An exp-run must be completed before patches with a significant ports impact are committed.

Yes, but we should be working on that. It's not to make it more formal, it's to make the sentences more direct.

Oops, sorry, thought it was a bare email address. Yes, it needs the "the".