Some questions about VSP01M01

Hello.
I want to ask some questions about VSP01M01.

1. Value of bit [21] VA instructions. In the tables 50 and 51 written
"fixed at 0". But in Table 52 (example), this bit is set to '0 'or
'1'. Do I understand correctly that Vload = 0, if indicated HA
sequence, and Vload = 1 if the executed VA instruction?

2. It allowed parallel connect the 3-state and 2-state output of
vertical driver? For example V1 and V2?

3. Why VA memory consists of several parts (VA1 - VA8)? After VA1-15
(0x18F), if it is not EOF, will be executed VA2-0 (0x190)?

4. May I use the delay to change several signals in the first pixel of
line? For example I need in pixel 1 set VD = 0 and HD = 0. Will it be
correct to do so:
             1023: HD=0, delay=2
             1024: EOL
             1:        VD=0, delay=0

Thanks