Can I use terminal command just like ConqueGDB?

[jkunlin]

It will be nice if there is a terminal, so that I can use gdb command directly.

[critiqjo]

Making a vim buffer to act like a terminal is a real pain, which will over-complicate things. So this was deliberately avoided. One thing you can try to improve ease-of-use is to assign a key map for :LL<Space>.