How important is imaginative/pretend play in a just 2 year old who shows little sign of interest in it so far?

[Pascha]

His taste for playing is much more riding toys, pushing toys, building and taking apart stuff, blocks/duplo in towers. If you guide him towards imagining stuff, pretending to push the broom, playing telephones, playing rockets in a big box, whatever, he just walks away. Doesn't get it at all and doesn't want to.

How do I gently introduce the concept of imagination to such a straight-minded literal boy? Can anyone give me some good games to try without putting him off completely?

Or should I just embrace the engineer/builder I seem to have and accept that maybe this is his idea of imagination?

[sazale]

Is there anything else, apart from the lack of imaginative play and speech,, that concerns you, Pascha?

When he lines things up what does he do if you move them/play with them? Does he line them up in any particular order?