Indecision solution
by Kegler

As indicated by the central entry MAYBE, MAYBE NOT, some squares (shown in blue in the grid) hold YES one way
and NO the other.  The grid shows either Y/N or N/Y (Across direction first), but the actual entries use the full words.

Indecision solution grid

Across
1EB(B)S
5INV + OK'ING (VIN anag)
11GORG + ON ("NO GROG" rev)
12POL{YES}TER (LOSER TYPE anag)
13LO-CAL + E
15{Y + (ES}TERDA) + Y (DEAREST anag)
16W + HELP
17GAZE(BO)S
19MOO + LAH (HAL rev)
20SHED (2 defs)
22{NO}RMA + L (MANOR anag)
26VA + LID
28S{NO}RE (RENO'S anag)
30R + OILED
31LURCHED (CURL HE'D anag)
33TESLA (TALES anag)
35EDIFI(C)Ed
38D{YES}TUFF ("DIES TOUGH" hom)
39ST(R)EAMS
40ETHA{N + O} + L
41SOM{NO}LENT (MEN LOST ON anag)
42A + STA
Down
1E(G)G{NO} + G (GONE anag)
2B(O)AT
3BREE + Z + E (E + Z + EERB rev, BEER anag)
4GO(ODB{Y)ES} (BODY anag)
5I + NCA (CAN anag)
6VOLE (LOVE anag)
7OLE (1st letters, rev)
8K{NO}THOLE ("NOT WHOLE" hom)
9ITSELF (IS FELT anag)
10GRA(PHI)TE
14C + LAMOR (MOLAR anag)
18S + MALL
19MA + Y
20S(MART)ASS
21H + ALOES
23BULLS-E{YES} (SUE'S BELLY anag)
24M(A)D
25DISAR + M (RAIDS anag)
27D + RIFTS
29{YE(S}HIV)AS
32D(ELL)A
34G{NO}ME ("NOME" hom)
36DUE + T
37CO{(YE)S}T
38DAL (LAD rev)