Oh gee I totally missed all those questions! I'll try to answer them from my unique perspective.

After all, we all have our perspectives!
1. When I have a SRS (PI), how does everything feel, just normally? For example, when I want, I can pulsate my penis, when you do that as a POST SRS MTF, can you do the same, but what does it do when you do that? It feels like it comes from the prostate.
Well.. I can actually sit, not touch anything, and work myself into an orgasm.. or if nothing else aroused. Don't have a prostate though so no clue how that feels.
2. When you sit down, and its finally gone, do you feel different? Do you feel like its missing, do you even notice?
Nope nothing missing. Then again what I had was unusual in the first place, and felt alien.
3. Can you concentrate more on work than ever before?
er.. no? lol
4. Do you still live a heterosexual life with a female? How is sex like now, and do you do anything different than before, i.e., toys, positions, etc...
I live with my spouse, but its not sexual. I play with toys, or simply rub the labia/clit (tmi?) I can enjoy vaginal stimulation too, but I start bleeding if I do it too much. Don't ask me, my vagina is different. I also DO produce copious vaginal lubrication on orgasm. No I had no colon resegment. I just have strange glands in strange places.
5. Even with minimal HRT, do you still have significant breast growth? How big? And how do you hide it?
Hm I probably could hide it, maybe. Its 36c but not HUGE in that I'm tall. Maybe.. But then again I remember before I even started on the path and my boobs had grown I was trying to hide that I had boobs and had women staring at my chest... er.. my eyes are up here.
6. Have you gone back to testosterone? How has it affected you? Or how do you think that it would affect me?
Because I have 0 T I actually went back on it 3 months to see if it'd help my stamina. Not only was there a negligible increase in my T levels, it didn't help.. so I went off it. Too scared of the side effects (aka hair growth).
7. Now that its gone, has it affected you in any negative way, do you miss it? And what do you miss about it?
Don't miss the crap I had before. I don't really like feeling raw/sore down there, and I most definitely do NOT like the daily cramps I get now, but that's a whole new story in a whole different area.
8. How are the possible toys, and masturbation? Does it feel the same as it is now?
I tell people this, and it baffles them. I masturbate the exact same way now I did before. I rub my labia/clit. What I had before resembled fused labia and an enlarged clit.. and produced the same experiences.. even BETTER now. I know, right?
9. Do you get erect, is it the same feeling as it was when you were male? And what exactly gets erect when you do?
My labia gets aroused / swollen basically. The vaginal walls get infused with blood & mucousy & secrete liquidy stuff. (definitely not urine.)