@@ -33 +33 @@
-<pos>&aux;</pos>
+<pos>&cop;</pos>
@@ -36 +36,2 @@
-<gloss>plain copula</gloss>
+<gloss>be</gloss>
+<gloss>is</gloss>

i think ksb is fine.  perhaps ktb, and if memory serves, this is also common in hiroshima and surrounds

I meant to say that じゃ isn't really Kansai dialect, but 
maybe used in other parts of western Japan - turns out I 
misread the quote somewhat. But what I was getting at that 
if a word is used throughout western Japan, should it just 
be tagged ksb?
I think an archaic tag might be better? Maybe with the ksb 
tag intact. 

the full quote from daijs:
◆室町後期以降の語。未然形「じゃら（じゃろ）」、連用形「じゃっ」、連体形「じゃ
る」の例は少ない。現代でも古風な口調や方言として、西日本を中心に「や」とも音
変化して広く行われている。

daijr says
〔断定の助動詞「だ」も同じ「である」から出たもので、中世末期から近世を通じて、
「じゃ」が関西、「だ」が関東と、方言的対立を示して用いられ、現代に至る〕

Well, that comment hardly contradicts it. Isn't it just saying it's pronounced more like "じや" in some parts of Kansai?

daijs, on sense 3: "現代でも古風な口調や方言として、西日本を中心に「や」と
も音変化して広く行われている。" is the ksb the most fitting tag?

I have had a go at it. See 2702090.

Probably not a bad idea to have a ては entry (Daijr, GG5, etc. do). Then a ちゃ could link to it (Daijr and ルミナス do that.) I'll try and get back to this one. Or maybe someone else would like to have a crack at ては.

See Below.

I did not want to alter the above, nor submit a new entry because I thought that the following was already on your site. However, I cannot seem to find it now.
You have "じゃ" for "では" in a range of situations, but I was searching for "ちゃ" for "ては" in the context of turning a sentence into a topic.
Perhaps the two things should be merged in the main entry above.
However, perhaps I have got it wrong, but "ちゃ" does not seem to come up anywhere. For an example text: ....を見つけなくちゃ, [this being the sentence turned into the topic].