From what I can make of your scenario, all you need to do is hit escape, select Open to LAN, turn cheats On and run the LAN server, from there you should be able to run any commands you would like as if you were Opped.
Skype (Required)(Can be messaged to me if wanted): AngeredLotus
Skills/Experience in Vanilla Minecraft: Played Minecraft since 1.2.3 Full Release, fairly experienced with Mob-mechanics and Redstone.
Skills/Experience in Modded Minecraft: Played Modded MC Since Tekkit Classic...
You do realize the FPS is only bad because you either don't have enough Memory allocated to FTB, or you just have a bad computer?
and the fact that the connection is bad is most likely because of your own connection.
In game name: AngeredLotus
Age: 12 (Turning 13 this weekend :D)
Where are you from: United States (Florida)
What timezone are you in: Eastern Standard
What attracts you to playing on a server: I have been looking for a FTB Mindcrack server, and this one seems to suit my needs, and with Pranking...