いまさらながら => Still ... now N3
Time
いっさいない => Not at all N2
Emphasize negative meaning
させてください/させてもらえますか/させてもらえませんか => please let me do N3
いささか => a bit N3
Evaluate
なさい => Do A (command) N4
Can, Should, Must
いまさらのように => Now... again... N2
Time
~たらさいご => If you do… negative result N1
Situation, case
なさい   => do this (soft/firm command) N4
Order
なさい => do this (soft/firm command) N4
ないでください => please don't do N5
くらいなら/ぐらいなら => rather than (do …)​ N1
さっぱり…ない => nothing/ absolutely not… N2
Position, perspective