I have no problem with getting home i only have to get 1 train from London whitch is a vt so going home isnt a problem.
If you have to get back home every night, then that does limit you with an ALR. In that case it's best to stick to regional rovers for now, plus any tickets needed to get to/from the rover boundry.
I dont think Liverpool Lime st has a time restriction its London, and Birmingham.
Kings Cross and Birmingham are easy to get around as mentioned. WCML and MML less so - the former means Rugby then round the Northampton loop; the latter is difficult due to no non-EMT services north of BDM.
I too am planning an 1st ALR this summer and have to get home most nights. So would it be worth planning it or going on a whim ?