Depends on the model of the 3in1.
PLS version is what I use and rumble has never worked inside a commercial game using it. Works with homebrew though.
It will rumble in akaio when changing the settings in the 3in1 menu and when the game is loaded it rumbles briefly but then once the game is loaded rumble is always greyed out.
I reported this, never heard anything and now my report has been deleted
As for ram expansion when I was last able to use akaio, it automatically enabled ram for the browser so all you need to do is put the clean rom on your sd card and then load it. You should not need to use exploader for that.
Make sure you check the 3in1 settings menu once, its in the second page of the start menu last time I checked.