Three pluses from me...
1/ custom sprites have been already added in vanilla recently
2/ -
3/ -
4/ maybe
5/ -
6/ meh
7/ -
8/ maybe
9/ RMB and MMB are already taken for other actions
10/ already available in vanilla for a long time (hotkey R)
11/ -
12/ maybe
13/ maybe
14/ -
15/ meh
16/ this is not as easy as it sounds... if you figure out how it should work, then I support it
17/ meh
18/ -
19/ -
20/ -
21/ meh
22/ -
23/ maybe... how should it look exactly?
24/ -
25/ -
26/ -
27/ -
28/ -
29/ -
30/ -
31/ there are other ways to do it, for example environmental effects in OXCE+ (just set them to affect only enemy and last 1 turn only)
32/ -
33/ -
34/ psi vision works quite OK in OXCE+ without a need for scanner
35/ -
36/ what?
37/ -
38/ + ... first plus
39/ could be done in OXCE+ already by recovering a special item and manufacturing a soldier out of it
40/ -
41/ -
42/ maybe... already on Solar's wishlist
43/ -
44/ -
45/ already possible to override shadow per alien deployment with "shadow" (vanilla) and "maxShadow" and "minShadow" (oxce+), can't think of what more could one want
46/ + ... second plus
47/ + ... third plus
48/ meh
49/ already available in oxce+
50/ -