Some(but not all) answers to follow. remember that learning any DAW after knowing another makes it seem tougher than it is
1. In Logic Pro you can easily delay(+/-) any audio/midi region in ticks without changing its position on the grid or even the position of midi notes inside of it (via the inspector). Is this possible in PT?
Check you tube for tutorials on the NUDGE function. Midi (and audio) can be nudged by most any amount you designate(samples, bars/beats or milliseconds), or you can set an offset in midi realtime properties(lots to learn
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2. Is there a keyboard command for changing the height of all tracks? Small -> Medium -> Jumbo etc. I know I can drag the lower edge of a track holding the option key or click on the vertical keyboard near the I/O also holding option key but is there an option to do it exclusively on the keyboard?
Using the modifier key will be a new part of your workflow. Holding it while making certain changes(such as track height) will cause all tracks to change. You can also grab the lower edge of any track(in the EDIT window) and drag it to the height you want(holding the modifier will make the change to all tracks)
3. Is it possible to change the clip gain of multiple clips at the same time by selecting them and holding some key or in any other way?
curious myself so hopefully a smarter person will chime in
4. Is there any other way to quickly change the volume of any number of tracks without grouping or grouping is the proper way to go here? Even if I want to quickly drop the volume of 10 completely unrelated tracks?
My option would be to select the tracks and make a group(probably named "temp" or "special"), make the adjustment and then immediately delete or disable that group
5. I have mostly the same plugins in PT and LPX but PT starts way, way slower, maybe in 30s compared to 5s in LPX. High Sierra 10.13.6. I have plenty of Waves plugins and T-racks as well. Pulling them out of the aax folder obviously makes PT start faster but does it have to do a quick scan every launch? Logic Pro X doesn't do that, only the initial scan is long and then it only scans for changes. Is it just the way PT does it or is there more to it I should know about?
The first time PT scans will be the longest, but it does take some time(something most of us learn to live with)
6. Let's say I have an audio sample on a single track. I want to duplicate it several times and change the pitch of it +2, +4, +5, +7 etc. In LPX I can quickly do it in the inspector using transpose function. I can also fine tune any region. What is the fastest way to pitch up/down several audio clips in PT? Audio Suite and some plugin?
If you enable Polyphonic Elastic Audio on the track with your clips, you can then right-click on any clip>select Midi Properties(this properties window will stay open on the screen until you close it) and you can adjust the pitch by cents or semi-tones. Once you finish, disable EA and COMMIT so the changes are rendered(once you are fine with the changes you made)
7. Is it possible to transpose by n semitones the input from my midi keyboard so that any record enabled instrument will play in the new scale? Again the inspector from LPX would allow me to do it. Also after recording something it would be possible to show the midi notes already transposed OR the original. Is it possible in PT?
There is a way to transpose while recording midi(I just used this cheat a week ago so I could play organ in an easy key), I just can't remember it at the moment(but it is pretty easy to find)