Your log book is for logging the different amounts for your own hours. Its yours and how you do it is up to you. The minimum requirements are actually quiet broad how you do it. After ATPL issue then all the little extras are finished with.
Now that's the legal side of things.
What company's then want when you apply for jobs is entirely up to them.
They may want JAR 25 time, jet, turboprop, multi crew, IFR basically they seem to create a different profile for every job.
If you lump everything in together your a bit stuffed later on. Everything separate and add together when required and its only a one off small calculation and no tipex is required and your log book totals equal what your CV says.
PIC is very important and they only want true PIC time. This only really kicks in after your go left seat which is usually years after it seemed like a good idea to lump in the PICUS. Then you have to correct things so the log book shows the true PIC total.
That jepps pro log book has a few extra columns just log it in one of them separately. Get the person to sign the remarks column that is PIC. When you come to CPL and ATPL issue just add it to the PIC column when declaring hours. IT makes life easier for the people checking the application as well because your only allowed certain amounts of it and they can quickly see what you have done.
This logging seems all very important when you have double digit hours. And then when you hit the license required markers its cause for celebration (quite rightly so) after your working and your doing 4 sectors a day and your doing 2 PPL courses a month of hours it becomes a huge pain especially when you miss a few days/weeks and your looking at having to do 3/4 pages of log book to catch up. This is where the electronic log book comes into play. A couple of clicks and everything gets downloaded, night time is worked out automatically and when some one asks for a break down of hours it takes 10 mins to pull the different totals out for aircraft types and status.