SciTE does support multi-caret editing, but to have it behave like SublimeText you have to implement it with lua or ahk probably.
but just highlighting, do you mean something like this?
SciTE4AutoHotkey v3.0.06.01 [Updated October 12 2014]
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Re: SciTE4AutoHotkey v3.0.06.01 [Updated October 12 2014]





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