If i capture with cineform 1440x1080 hdv 50i 25fps (pal land) and edit on a hdv timetime in cs5

when exporting in cs5 for bluray should i output the same as the source meaning 1440x1080 then select h.264 bluray hdtv?

Is there any reason why i should upscale to 1920x1080 (square pixels) when outputting for bluray?

Title or post graphic elements. These are the best reasons to prescale 1440 to 1920 and edit at the higher resolution, so your BluRay will benefit from the extra resolution -- otherwise 1440 is fine. No point is upscaling upon export.

So if im working with encore menus after effect templates for example incorporate a photo montage with my project most templates are in 1920 could i mix that with 1440?
or do i have to edit from a 1920 timeline from the start given that my xha1s captures at 1440x1080?