Z-seam initial layer

[WhyIcanBuyMe20atAnyMarket]

Is your feature request related to a problem?

For small, thin, parts (only a few line widths wide), the position of the z-seam on the initial layer can have a large influence over bed adhesion. If it is in the middle of a long wall, the nozzle reverses direction an extra time compared to if it starts at an 'end' corner, thus increasing the risk of delamination.
Again for small parts, the z-seam a very noticeable feature, so I like to use the 'random' option for the rest of the model, so as to avoid spending ages with a Stanley knife removing the seam after printing.

Describe the solution you'd like

I'd like a setting to add a z-seam control for the initial layer separately from the other layers.

Describe alternatives you've considered

Other settings which influence bed adhesion (initial layer speed, enabling raft, etc.) can generally compensate enough to allow the print to not delaminate, but this comes at significant expense to material usage and print time — a raft easily triples the print time of a small part.
I am in the process of writing a post-processing script which can move the layer start to a user-specified location on a per-layer basis, but this is only limited in scope as incorporating retraction combing and suchlike is far beyond my ability with python code. Hence, if this could be incorporated into the main cura engine that would be much preferable than me trying to bodge it.

Affected users and/or printers

This would benefit all printers. It would be particularly helpful to hobbyist users, as they tend to value lower material usage and print time over meddling around with print settings, and to users who print small parts, as these parts are most susceptible to delamination.

Additional information & file uploads

[HellAholic]

Another alternative solution you can try is using a cutting mesh to modify the z seam position at the first layer.
I didn't have a similar model at hand but here is an approximation:

• Model z seam set to user specified (back)
• Added a cube and set it as a cutting mesh
• Increased X, Y to cover the entire model
• Set height of the cube to the initial layer height (in this case 0.2mm)
• Modified the Z seam settings for the cutting mesh overlap
  So first layer looks like this:
  
  and the rest of the layers have their Z seam at the back
  

[WhyIcanBuyMe20atAnyMarket]

Oh yes, I forgot about cutting meshes! Thank you!