The "last clicked parameter" function of the +/- buttons is your best bet. It seems, from the nature of your posts in general and what you have been asking, that you would be well served getting a control surface.
i do want a control surface... but not before i figure out if i've got any talent.
when i'm mixing, i can't even switch tracks and bump the level and pan without opening my eyes. to be great at anything musical, you gotta close your eyes and open your ears like a blind person. having to squint and move a little mouse over a little slider... am i taking crazy pills? shoulda been the first key command ever made.
Of course you have to be able to open your ears, or rather, learn to hear what is going on as opposed to just listening. You also have to be able to differentiate between your senses, but you don't have to close your eyes, in fact in many musically very demanding situations you can't. Do you sight read music? If you do, you will know that a good reader blends the ability to interpret what is on the score he/she is reading from (requires using the eyes) together with listening to his/her own instrument as well as any other musicians or playback present and interpreting everything to make it sound nice. Oh, playing in something like a big band or orchestra, throw in having to keep up with both the score and conductor. Playing in any sort of live band, especially any sort of improvised music, you will have to watch other players, singers etc. very carefully for cues.
I would maintain that all of this is a lot harder than selecting some screen element with a mouse and still using your ears to tell you what is going on. BTW, I do both - as well as music recording/mixing work, I play drums in large group settings such as a big band, or orchestra and choir, or the backing group for a gospel choir. All of those gigs require me to read, and most certainly pay attention to the conductor and what the other people on stage (sometimes more that 50) are doing. Trust me, learning to adjust some audio parameters on a screen without losing the perspective of using your ears is very doable.
with you on that, there's just times when you need a visual clue. not now though. i don't get anything out of playing duck-hunt with the fader and the mouse. course it's doable, but why have that distraction when you just wanna get deep into the listening?
besides, aint that about the most used control on a surface? select track X, level up, pan left? i've got a hundred brand new, never used logic key commands in my attic. trade ya for any of those 3.
Yes but you don't juggle tracks with a control surface. And you don't select a track that is far away while you work on one (your other question in this forum). On a decent controller you have 8 faders and some knobs and your arrange tracks are layed out to fit your mixing needs. Control surfaces are organized in fader banks (groups of 8 faders each). Mix the first 8 tracks, switch to the next bank and you know that the bass is on track 5 there. Volume up, back to bank 1, pan the trumpet on track 7 and so on. You simply know what is where and as long as you deal with volume and pan, you work almost as fast as on a hardware desk. Plugins are another story though.