Oliver said:

FILE  Simple Dorian Exercises.  First bar slurs the E to second measure and then picks up the F.  Why isn't the larger slur adequate to connect the 3 notes without the separate slur of E's ?

It's adequate, I just want to emphasize that the two eighth notes form a quarter but the little slur is not necessary.

What is a reasonable practice tempo for these exercises ?

Start where you can and work your way up to 1/4 note = 120 and be sure to swing the eighth notes.

FILE  Minor Dorian Scales.  Is there a specific purpose for having two consecutive downstrokes in one measure?

Yes, you need to repeat them over and over and by not playing a down bow at the end you end up in the better part of the bow for repeating. Also set to play down-bow when ending on an up. Always thing economy of the bow and plan the usage of the bow in advance.

Also, suggested tempo?

Begin slowly and work it up as fast as you can. No need to be in a rush. Better to be accurate. When you become accustomed to these scales you can work up the tempo.

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(Is Sevcik Op6 for beginners dead link?  It is pretty interesting beyond pg. 30.)

Not really a dead link, just a description for band 1 and band 2. Kind of like a title.

Sevcik – Violin School for Beginners Op6

• School for Beginners band 1
• School for Beginners band 2

Good questions Oliver