One or more of the kanji forms can be found in 国語辞典 Without a case being made and references being provided an edit like this cannot be accepted. Normally I'd revert such changes but it's easier just to reject them.

@@ -4,7 +3,0 @@
-<k_ele>
-<keb>然して</keb>
-<ke_pri>ichi1</ke_pri>
-</k_ele>
-<k_ele>
-<keb>而して</keb>
-</k_ele>
@@ -14,3 +6,0 @@
-</r_ele>
-<r_ele>
-<reb>しかして</reb>

Two Tanaka sentences map そして to "finally".

http://thejapanesepage.com/forum/viewtopic.php&p=96702

I quote the message of this guy
"I think it has a strong sense of finality. (So it's more 
like "Finally," instead of just "and") 

I used to use it to much, and once when I was talking to 
my teacher at language school and said it for the 3rd or 
4th time, he suddenly laughed and exclaimed "またそし
て？？？". The first time I said it (I assume) it sounded 
like I was winding up my explanation... but then it just 
kept dragging on which surprised him. 

Maybe something like: 

Today we went to a movie, did a bunch fo stuff, blah blah 
blah and then finally we got home and were tired.

@@ -24,0 +25 @@
+<gloss>and finally</gloss>