These are all alarms and remote start systems. So they will lock, and unlock your doors with the remote that comes with them. So, you will no longer use your stock keyless entry remote.

No other module is required for the key less function to work. You just have to have your installer hook the alarm to the locks of your vehicle. This is something that is standard on a complete install.

 

That's the thing, I don't wanna lose the FAST Key function. I'm so used to it now, I hate the thought of fetching the remote and unlocking the car (I know, I know, not much efforts reqd). Last year I checked, there's an additional module that must be installed to allow the keyless function to work with 3rd party Alarm/Starter.

EDIT: Here we go.. I believe this is the module I was referring to..Looks like its out for 08+ Lancers
http://ifar.ca/en/vehicles/mitsubish...-fast_keyless/

 

I understand not wanting to lose the FAST key function. That is different than regular key less entry, and is easy to get spoiled to. LOL

The module you showed says it is compatible with FAST. The only thing I wonder about, is if the car is remote started, I am not sure that you will be able to unlock the door just by gripping the handle like normal. If it does, then all you would need to do is get a remote start only, or not hook up the alarm part of a alarm/remote start combo.